Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9aa9f26f34e490…

MALICIOUS

PDF

58.9 KB Created: 2020-11-13 10:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 98eff92afc8a2e7dc07fcf843446ec4f SHA-1: bcc9208e5b516498192d326bf965541c9d12324c SHA-256: 3a9aa9f26f34e49089f76c92c3990fb6dfbf16673516ec93cfbcc2fd31e9b7aa
156 Risk Score

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. 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 0.9996

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.
  • 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://trafftec.ru/123?utm_term=delta+1400+series+cartridge+replacement PDF link annotation
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/6b565642b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f99cbb29d911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5fa6002e605bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f8d4d0dca115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f9aaa1740682.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/1fc3bf2a93a194a.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/jeromopelurab/audio_english_dictionary_pronunciation_free.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/8388613033.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/foxogar.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/malojavasi.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/34678953889.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/augustiner_beer_maximator.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_off0000a950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA950 5676 bytes
SHA-256: c1316cc0edffb3485c2431359167d653b646581000059c51589f241c77fdb7f4
font_01_sfnt_off0000bc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC96 10132 bytes
SHA-256: 8fe56a5678b08267e6918ab384c6b2ca6e4183d9d2cf80246c7e7032ef8c31b1