Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8a7501ad9cb8b0…

MALICIOUS

PDF

78.1 KB Created: 2021-06-02 12:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e57b3692aa27051e0776aa1c4e6a21c SHA-1: 8175dc9df28eb4b83cf7e69a95c952e81908d858 SHA-256: 0d8a7501ad9cb8b0e4acd7693f4cf26731f74df42823ce441d9dd4b7e4daa453
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent support number. The presence of numerous PDF links, including one pointing to 'golowaki.ru', reinforces the malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=att+uverse+remote+s10-+s3+manual
    • https://static.s123-cdn-static.com/uploads/4379374/normal_6009380494db1.pdf
    • https://cdn-cms.f-static.net/uploads/4487903/normal_5fe98cb3c29bc.pdf
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/fd8e83d7cd.pdf
    • https://goziluzigawu.weebly.com/uploads/1/3/2/8/132816100/sivajajud_wizuwo_devaxuz.pdf
    • https://static.s123-cdn-static-d.com/uploads/4458144/normal_60b2ba2321576.pdf
    • https://static.s123-cdn-static-d.com/uploads/4473419/normal_60b6c4173f289.pdf
    • https://cdn-cms.f-static.net/uploads/4445743/normal_60459069efce0.pdf
    • https://cdn-cms.f-static.net/uploads/4465705/normal_600ebf5d547cf.pdf
    • https://cdn-cms.f-static.net/uploads/4378831/normal_6050e2148b98a.pdf
    • https://static.s123-cdn-static.com/uploads/4480162/normal_5fca2e0a5898d.pdf
    • https://daxeluneb.weebly.com/uploads/1/3/4/3/134324592/polaverakenuzobepusi.pdf
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6035988d9d889.pdf
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5fd789a6cee2f.pdf
    • https://cdn-cms.f-static.net/uploads/4381752/normal_605050dda43a5.pdf
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5feee7bddc1bb.pdf
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/fdca740.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_604d423e8b9c2.pdf
    • https://cdn-cms.f-static.net/uploads/4384832/normal_602acde7e946f.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6022c1f415f07.pdf
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fe92943c6773.pdf
    • https://cdn-cms.f-static.net/uploads/4422133/normal_6063f4f368eb1.pdf
    • https://cdn-cms.f-static.net/uploads/4450426/normal_6019786507595.pdf
    • https://cdn-cms.f-static.net/uploads/4384048/normal_6051f95971850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ae.bin
029b99f53d2e8592f60a87258ce5586782a433bcd7c92c0ac0bfce53bb53007e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 5272 bytes
font_01_sfnt_off00010492.bin
f8e039b747ad8e2f301d0afaf8ae3f97cb59d987fa708fe0b53f697d7f096563
pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11204 bytes