Malicious PDF — malware analysis report

Static analysis result for SHA-256 031c85043c0c0453…

MALICIOUS

PDF

69.3 KB Created: 2021-02-24 20:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f3c7b1712fbea92c1bbb4797f52b0c1e SHA-1: 749de2979bb8b18b60099325fd92dfdc8e96ff1a SHA-256: 031c85043c0c0453b7fe7324a111d3253a1bffb13986e923fa74cda9c680a2d1
184 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, many hosted on disposable domains, suggests a link farm designed to distribute malicious content or conduct phishing attacks. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

Heuristics 5

  • 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
  • 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://druttle.ru/award?keyword=plantronics+voyager+legend+pairing+issues PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fc852560fbad.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/6fjajip/70450240798.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/dANIjjt/hang_glider_for_sale.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/dofinukixiwe.pdfIn PDF document text
    • https://xemawegomefere.weebly.com/uploads/1/3/4/7/134736207/1873229.pdfIn PDF document text
    • https://wegekasi.weebly.com/uploads/1/3/4/6/134678838/vawidarulo-vujewazavab-danafig.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/229fee.pdfIn PDF document text
    • http://xidakuxekon.22web.org/cecelia_ahern_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcb1eb588c63.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/jjbghbl/71143871827.pdfIn PDF document text
    • https://gebowajawuma.weebly.com/uploads/1/3/4/5/134582097/e45fa.pdfIn PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/voxak_gigibomoxadirid_nekus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6035f7a138778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujafugakare.epizy.com/rojegenotikad.pdfIn 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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 5404 bytes
SHA-256: d5e6256ff8edd541062acbf45d0f038e4c76c828083244ab18b4ca02c3f06e45
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10692 bytes
SHA-256: 4cad09f3fae3e42c210d1939e9388ecf640207db1b3bcd4d074114ba725ae495

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