Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a210ff0017ba09d…

MALICIOUS

PDF

83.3 KB Created: 2021-04-23 11:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 690751a5cd4c3f200595b113a933e904 SHA-1: 7c85c807a1e4970fd6dbb2034a292f120ddf8509 SHA-256: 6a210ff0017ba09d6c48710ded5238e165e9d8dd7268945a5135bb18ed9f980e
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://dafemum.ru/strik?utm_term=how+to+relight+pilot+light+on+vaillant+boiler', is flagged as a malicious redirector. The document body, though partially corrupted, contains keywords related to boiler repair, likely serving as a lure. The presence of numerous external links and a flagged malicious redirector indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=how+to+relight+pilot+light+on+vaillant+boiler In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_604d22136c6bb.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/sodomabevofowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fdd88e3b4ac0.pdfIn PDF document text
    • http://vitrinachel.ru/rezawiveteboraravaworeg6nvf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_5fdb6e4166ae1.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/443107857088y6ex.pdfIn PDF document text
    • http://vk-settings-change.online/best_crossfit_app_freecpuxt.pdfIn PDF document text
    • http://vittorguxx.site/lg_mobile_switch_stuck_at_99f849k.pdfIn PDF document text
    • https://lubumona.weebly.com/uploads/1/3/4/6/134648672/9549909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_600d515ca67ea.pdfIn PDF document text
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/rotopoxobexigatim.pdfIn PDF document text
    • https://raxokada.weebly.com/uploads/1/3/1/4/131409035/melatojuxadof_lonezave.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/df329f08e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/sapezefixaviwozofuzizosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f21162-4734-4217-ac2a-bd50b046e19d/67459609321.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_2ca9ba45b03c48dca94cb577597ec09f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taguxif/tapekabexaw.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_6ecbc4c3b29e481f81ebb7ea34b64d73.pdf?index=trueIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_4548c27e6c674ed4979dd2e4208b2e99.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_08ab061167d349068d6c12fc1dd0e1e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/071a65a3-54fc-42ab-a817-ae0c28ffc95a/guziveremedox.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/rivekijeresipolupi.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_82b4b68995ad48348d3b4c5aece3949c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be4dada-1a82-4683-a24e-d90d46ad8183/what_disorder_causes_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0465fa50-ee77-4e83-8a55-b0d4dca66d8a/36872651990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf3d7ee-ce8a-4cc5-a19a-f257744ead47/fozitatodibadugewo.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/brokerage_invoice_format_india.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/58787001945.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 5156 bytes
SHA-256: 7c160f27e76a3f298d0d450af5274c07ac64f40bfa987148c5606d395402621c
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 11212 bytes
SHA-256: b66b1788ab9742392bea606aa981da3e4ad0b93a15f7f221b670778eee96d073