Malicious PDF — malware analysis report

Static analysis result for SHA-256 a725f73ac4c744e0…

MALICIOUS

PDF

68.7 KB Created: 2020-12-05 13:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6ebc2f5f29a4f32a0912921200e47764 SHA-1: d255e5c5e04be1d81f3eb73d343589e8771a3cb0 SHA-256: a725f73ac4c744e0bb37c24e2d26f9ffe049cb895c748f5fc88bcff897a4f7f5
246 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 brand-impersonation credential phishing. 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 0.9997

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bowulotufevep.weebly.com/uploads/1/3/4/5/134595608/beroxamexug-zejudikifesadu.pdf.
  • 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://traffnew.ru/strik?utm_term=edx+course+reviews PDF link annotation
    • https://bowulotufevep.weebly.com/uploads/1/3/4/5/134595608/beroxamexug-zejudikifesadu.pdfIn PDF document text
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/1879096.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/6813cba1eae81.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/jiwutasivox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f887252e7c97.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/lusidizebojedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1d2da12facd59ceb37db7/t/5fc592149ee0f32b8712ca2a/1606783509356/93434492483.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/61848420980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdd94c6-0caf-4787-b53a-9d5ae36957f9/temel_elektronik_kitab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3627318d-af21-4d53-a76a-06aa2506bbb8/colligative_properties_ice_cream_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0e2191-7650-4e01-a159-8e72963228f4/angles_and_segments_in_circles_worksheet_answers.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_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 4868 bytes
SHA-256: d24ab960694fa4eb36be00bd0040b3bb76304ccd6ec261603d6424b5606ec887
font_01_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 11212 bytes
SHA-256: 0c167ea258abfe094b068fac4caaabb8f3ad1c49d36f5293f1ab175def9b4f13

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