Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3de86c386a5c61…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 06:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 30c199366c1d6d3706d6cdda85ceda04 SHA-1: 8b42aba31172e7f2e87512d8808d135f796d17d6 SHA-256: 3a3de86c386a5c614012c1f3c9283d363e53fba7f697e5f56efdfd1aa5f85987
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=eduardo+galeano+el+libro+de+los+abrazos+sinopsis PDF link annotation
    • https://cdn.sqhk.co/sirejeforox/PZDjgje/xudobedib.pdfIn PDF document text
    • http://podjem2.club/zero_to_one_peter_thiel_espaoln9g6w.pdfIn PDF document text
    • https://cdn.sqhk.co/modebopogut/gcieFMs/lafododobuxajisipur.pdfIn PDF document text
    • https://cdn.sqhk.co/zujagepax/hjviigh/movuselefoxajof.pdfIn PDF document text
    • http://pop-marketplace.ru/aliens_vs_predator_2_primal_huntoys92.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/Phchivy/61659846355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_602befa48d756.pdfIn PDF document text
    • http://vinograd.io/mallela_theeramlo_sirimalle_puvvu_full_movie_watch_onlinecd6zt.pdfIn PDF document text
    • http://brandframeb.com/halo_contact_harvestwi1z3.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/sapojipuvazapuret.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/c6hhEUg/sokuxuzexupasesomevuxip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/inventory_aging_report_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/unication_alpha_elegant_pager_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/xexuzedejowivele.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/clark_rubber_foam_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 5076 bytes
SHA-256: c8a0f7334e8110c551b3669f6dacfe3700b405ba65be8036cd191c3f2a019ee3
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 11800 bytes
SHA-256: 9eae3a81f0b4d0b2ed199f3903b365fed676c2f6ba123ae215e901783e45645c
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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