Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecbf1842c96213c…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 19:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 28b313a9735deb8c738223e4e2595fb3 SHA-1: ba9efc34cdcffb0f87a0d0e0471c3c56a24627c8 SHA-256: aecbf1842c96213c4021dd5ac8fb0f744ee4bf51fe8da5426c49d8cf6e716f64
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or known redirectors, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, contains text related to book searches, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=real+book+6th+edition+pdf+bass+clef In PDF document text
    • https://cdn.sqhk.co/perekowemo/cRibidP/jelly_shift_mod_apk.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/81103397301.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/vajunexepupivikober.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/dXgiVie/redbox_near_me_games.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/6323335.pdfIn PDF document text
    • https://gebedosoxabitox.weebly.com/uploads/1/3/5/3/135324181/9883443.pdfIn PDF document text
    • http://desokore.medianewsonline.com/fuxaxogijolutejexan.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/1608874.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/duzetis.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/a4D1Qgg/sojotifuledudifi.pdfIn PDF document text
    • http://terugate.mypressonline.com/20252149407.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/IiiZjcZ/mutants_genetic_gladiators_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/Vxgcajb/kewezajajujul.pdfIn PDF document text
    • http://whitecheat.xyz/6665972341059vsd.pdfIn PDF document text
    • http://mandarin-fruit.space/6807926326nir4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5512 bytes
SHA-256: 973e53e7a27451be695668ec964c6d5e992896a9b57d29b6ad8de5bb9ebae281
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 13128 bytes
SHA-256: 95667f2679623c14a342460fa928f96e120c5195af6cf29007a731cc4dc37272

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