Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab50b625aebd2a8c…

MALICIOUS

PDF

68.1 KB Created: 2021-06-02 21:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf1f7c1114adffb0033572cafbf04c5a SHA-1: d35f15792a097c3582bd7527c62d5aba07cde00f SHA-256: ab50b625aebd2a8c63bcb3faf0bc29054c682ead1c8a1fdb047c42bd507304b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. The primary URL, https://queure.ru/pbw?utm_term=what+is+bunker+in+shipping, appears to be the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=what+is+bunker+in+shipping
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/mirepug.pdf
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5fd7cf7bd66bc.pdf
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5ff45f4cdcbb2.pdf
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/kigokomelogapomo.pdf
    • https://cdn-cms.f-static.net/uploads/4381738/normal_604cc9d96bd1c.pdf
    • https://cdn-cms.f-static.net/uploads/4383149/normal_606a75a470553.pdf
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/mijekawitar.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_60639c7013cd7.pdf
    • https://cdn-cms.f-static.net/uploads/4427781/normal_603176da5d90a.pdf
    • https://rofonoxerip.weebly.com/uploads/1/3/4/3/134312531/rawebiz.pdf
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/gijodawonimulimijo.pdf
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/a65d728.pdf
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/dujap-rividesa.pdf
    • https://vofesoxofibebup.weebly.com/uploads/1/3/4/9/134900141/gukotadejonitojuwote.pdf
    • https://rirosivipoxutu.weebly.com/uploads/1/3/2/3/132302830/dowolitakebowirik.pdf
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/344105.pdf
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/d5c61db80a18.pdf
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6036b093f068a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zufogopojut.pbworks.com/f/kamusi_trki_szlk.pdf
    • http://vifogajo.pbworks.com/f/xudibum.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_off0000cd94.bin
eb41f0768fd8549912cbbedfcf744e1a6237e0f321de23829fd6b396dc397b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 5268 bytes
font_01_sfnt_off0000df85.bin
91e7356f85934d41c9f37d1e20ddbf4ce055e78964e656af3b76a4173a0697be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 10656 bytes

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