Malicious PDF — malware analysis report

Static analysis result for SHA-256 baff7d9366423d79…

MALICIOUS

PDF

65.5 KB Created: 2021-01-08 11:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0340ae5ac4c556e22b38ba31d35d76ee SHA-1: 5f97d6ee31a41c8bd43ca57fc9744f3ff24fa923 SHA-256: baff7d9366423d79a74a4f94dc677fdfd351ab6db413efc2a414b9a404c5758d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, many pointing to PDF files hosted on services like weebly.com and cdn.sqhk.co. This suggests a link farm or phishing campaign designed to redirect users to potentially malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://traffnew.ru/123?utm_term=f+test+stata+hypothesis PDF link annotation
    • https://cdn.sqhk.co/manuguwe/gLtijjf/98197026320.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/bizezodopot.pdfIn PDF document text
    • https://ramujodavuratot.weebly.com/uploads/1/3/4/6/134667495/jalos-loranefikuto-jeporibosom-gedajaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/icUibgd/35967846749.pdfIn PDF document text
    • https://gatixitawenubik.weebly.com/uploads/1/3/4/6/134643062/kekatavaposojug.pdfIn PDF document text
    • https://lajakobu.weebly.com/uploads/1/3/4/5/134599687/sanigaxalotasizokel.pdfIn PDF document text
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/nixaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/ZlrGM3p/radiant_church_give_online.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/6077981f-0cd6-4a7a-83d1-1ce53cb6c723/how_to_chop_green_onions_for_garnish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a0b00f-363c-490c-8ee5-d324146977b8/visual_guide_to_elliott_wave_trading_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd99ccc0-ec63-4289-9194-bf5d2a8ba051/15111904097.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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 4836 bytes
SHA-256: fa5220a79bd5e71ce88b45a0e647069c2efdf84a41a924c3970546936dc13057
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 10588 bytes
SHA-256: 4f95f18f0aed1dbd2dd5ac9d8fd8ba5b0c22aa85cbb17e97d066af12844c38a5

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