Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2f2c078b98a740…

MALICIOUS

PDF

68.4 KB Created: 2020-11-25 18:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d56b0532291e3ed90f220bcfd0bf4823 SHA-1: dd4c1e12278f3fc1ccd061d5fccc65d105038a8f SHA-256: 3d2f2c078b98a74089459cd2172d96ebdf6c751faa240ef3c1250246fd769a84
176 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. It uses a callback-phone (TOAD) lure. 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 0.9995

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffi.ru/strik?utm_term=usa+sex+guide+md PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fb945e7c996e.pdfIn PDF document text
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/3293099.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/fosikekovorazi.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/ladojenefe/science_dictionary_english_to_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b15a9ff-dd68-4b37-9d5c-02502539515f/xasemikatexoxibokevirug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c01fe97-e79a-45f3-9932-4fdf1cd4aefa/5424447904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b440c742-9d7b-4be6-b114-26ae362c1514/28626188201.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/this_boy_s_life_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f31525-cca2-49c8-b81a-5712440789cb/99915883578.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_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 5076 bytes
SHA-256: 7764fb84598efa84ad9e70452708c5ecba46823b2052fa3f28e574662e7b9e47
font_01_sfnt_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 11452 bytes
SHA-256: bcc58cd42e5e234ee3596ea4bdbdff9082030123aed55104f7605b6245e1c61c

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