Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63bd5a4711c9cf2…

MALICIOUS

PDF

81.5 KB Created: 2021-01-24 12:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4a83a5ffa9e0d2a73a3e955e92854e53 SHA-1: 11dc38157fb4070e18fbf5cd5b3b1a9ed9bc04d2 SHA-256: c63bd5a4711c9cf280fe3a0772d1b3bfc9a06c77fb6480a8b4f2fda61e170c37
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/123?utm_term=b%2526m+transmission+cooler+4runner PDF link annotation
    • https://timowerudep.weebly.com/uploads/1/3/0/7/130738780/2950234.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/9977456.pdfIn PDF document text
    • http://aarbuz.space/dragon_ball_pixel_character_creatorukdkp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff048d5965d1.pdfIn PDF document text
    • https://busedulaxuxelo.weebly.com/uploads/1/3/1/3/131379622/weref.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443823/normal_5ff6630b90fba.pdfIn PDF document text
    • http://accface.in/pujidazakajozagunepusvkml.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc81908e2a34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5ff45462c2565.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/5106643.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/gukuzijaviwamex.pdfIn PDF document text
    • http://pc-remont.website/345669054297urn8.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/64805574244.pdfIn PDF document text
    • http://termometr-medikal.site/90653152478blqag.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/jivamubug/govewogizanez.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/75445501958.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_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 4204 bytes
SHA-256: dcd5a6912a87ecfe1891435575a2a15c556a01ed13ff47412b4b7aff6dcc22e6
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 10640 bytes
SHA-256: 6e79af58773435bbafb6364f7bdee58d2049277b095f87eba1573928e1db2184

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