Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f3e8ac830922d7…

MALICIOUS

PDF

81.5 KB Created: 2021-03-23 22:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b25614261e509bd02890383780626489 SHA-1: 5396c8d11497854c30b828eff2f37ecb4a682e0d SHA-256: d2f3e8ac830922d7b06bf030f1bd4e4cde716b829cfa5e9ea26a66ac8c4640b9
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://jumiwimov.ru/strik?utm_term=what+is+the+best+rated+rental+carpet+cleaner+for+pet+stains PDF link annotation
    • https://cdn.sqhk.co/wejupexuput/BkJmhgt/78069932314.pdfIn PDF document text
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/8764732.pdfIn PDF document text
    • https://xosagosogasimaj.weebly.com/uploads/1/3/1/4/131453054/setowopofot_sumawagipeb_fitegapoli_xudonob.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/cjjiuhj/smartwool_merino_250_beanie.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/ahbgiZr/age_of_thrones_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/etqbGgj/send_files_to_tv_app_apk.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/rubin_kuzuwitogixana.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/djbgjLm/daily_todo_list_app.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/bWicIhc/sas_zombie_assault_4_apk_mod.pdfIn PDF document text
    • http://gagerovovus.22web.org/29601679100.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/mjafljb/terupupupikotenogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af68b49b-aba4-4af1-8ad3-6089622cdf50/what_is_the_top_1_percent_income_in_canada.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_231ffe8b5daa4221b6fe4053744bd119.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4922ae4-3549-4616-a09b-01e2eeeea91c/21071552379.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_a03d01a65eac4da1840d39287eab4e96.pdf?index=trueIn PDF document text
    • http://warugadagix.rf.gd/69877147927.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_0f11f787a81a41df86174394c47a95c2.pdf?index=trueIn 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_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 5396 bytes
SHA-256: 8c103958d2fc09f9bbc0efddb8fdb42f5972494351fbeb8585165e3425116412
font_02_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 11036 bytes
SHA-256: 8ff888cb81dd831ed8b0d6cae66b6c095de00389b15498324c3354b255ba2d75

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