Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb6d6a8bb9c57dc…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 00:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2172459b466b1942a8662cf931ce036a SHA-1: efb6fae3b5df97f51cb8fbaebbd48b73001c223d SHA-256: 8fb6d6a8bb9c57dc9ccef8f7be8745a1571bdb6c4136a9369016d4aaf0b67c07
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing or malicious document. It embeds external URIs, specifically pointing to a URL that appears to be part of a link farm designed to distribute other malicious PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=pro+elite+air+fryer+reviews
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/fobikeminoseb.pdf
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/1661945.pdf
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5fec3fab49c86.pdf
    • https://cdn-cms.f-static.net/uploads/4417141/normal_603555ad0b2ad.pdf
    • https://xizonadap.weebly.com/uploads/1/3/5/3/135326441/wozolipi-mozugulejir-butofizo.pdf
    • https://static.s123-cdn-static.com/uploads/4494429/normal_60052732c94c6.pdf
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/darudifigavuwem_lowiw_tinajimune.pdf
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/2388525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_eafa6b4ab83641bba0f913fbceb3b723.pdf?index=true
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_035e79542488497b8363817797d1cd9a.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_54587a83a9b8436a8abf305b53dabb4e.pdf?index=true
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_76911525171d44348eb631dc4387a317.pdf?index=true
    • https://s3.amazonaws.com/fibesezati/66256652351.pdf
    • https://s3.amazonaws.com/tutasujal/zumepotolenojajuza.pdf
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_742b491241fd4421a68fb2e9f5ef8109.pdf?index=true
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_8ab2c0d73ac140c9bacce0a2d82281e7.pdf?index=true
    • https://s3.amazonaws.com/defipedibe/anita_baker_no_more_tears.pdf
    • https://s3.amazonaws.com/fizup/spacing_in_formal_letter_writing.pdf
    • https://s3.amazonaws.com/vonusirukete/mejuwutonafuno.pdf
    • https://s3.amazonaws.com/sefepugolupalax/tebazos.pdf
    • https://s3.amazonaws.com/ropuba/59133277019.pdf
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_89c1a8463e634e61984e90d213cc4685.pdf?index=true
    • https://s3.amazonaws.com/xoguwavosuje/ditevupowok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f814.bin
c9850cefda0fc86c7b03d18bc66a7697937f7d61f646e915f41c5105e881e335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5016 bytes
font_01_sfnt_off00010950.bin
2e96d67b36bc611dd476350f0380bbf0fdf7d14b3c0b35a19d57032e9c513db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 10776 bytes

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