Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83a09c7fb00e6ef…

MALICIOUS

PDF

69.8 KB Created: 2021-01-05 18:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f3cf9beb30951e9d712feafc10c4426 SHA-1: 952356de9549a2467192334f6c85e85a56ed78e2 SHA-256: c83a09c7fb00e6efb8cfc77e596010109d7bf00ba6004af5a03939b54b22db93
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution document. The presence of a large number of external links, many pointing to PDF files hosted on domains like 'weebly.com' and 'cdn-cms.f-static.net', strongly suggests a link farm or SEO manipulation tactic to distribute malicious content. The embedded URL 'https://trafftec.ru/123?utm_term=neosporin+yeast+infection+rash' further supports the phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=neosporin+yeast+infection+rash PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f89721aaf4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_5f9b52acb01d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5f91a1dbbf82e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_5fda2366ea8d7.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/mivujovukidini_xofutawex_xotomiveriz_wepetasinewelaf.pdfIn PDF document text
    • https://cdn.sqhk.co/padirazemi/gjgh7id/price_is_right_live_reviews_2018.pdfIn PDF document text
    • https://kujituxozi.weebly.com/uploads/1/3/4/6/134625238/xetegole.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/hh1NRtu/anime_studio_story_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f941412b0b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f903ff83f88e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416796/normal_5fef049708209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a77e9bc-a027-4b51-a0ec-51b48760f213/jukaredasokatonizisajud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeead7d5-3c7b-4c86-8236-cb79d6a3a55c/greek_yogurt_strainer_malaysia.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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 5144 bytes
SHA-256: 12e5a4f920071c8226aba88f6b20bb83480225762756891c20df63681237516e
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 10044 bytes
SHA-256: 846bc56be93f72e428938bcd36b4e72cd8225f0cfd9b683511563dff7afea569

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