Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b54a0487da4c51…

MALICIOUS

PDF

72.9 KB Created: 2021-03-27 23:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 631c0e51332935b98a5ed6d60af0f58e SHA-1: bf8c8c8a6fce654d5230fa44ce80666d971abe72 SHA-256: 75b54a0487da4c510470f47499a056f7d1e1eab9873f33cfcd52ffc28b41377b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://resalured.ru/award?keyword=subject+verb+agreement+quiz+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466680/normal_5fe8d03586bee.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/rhaSham/vunavodamuvasoz.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/82118480876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_6005fa4a91a3d.pdfIn PDF document text
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/pibezo_virubeleretun_vizegutoxe_vorim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_600592412de40.pdfIn PDF document text
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/kasopor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5feaf3f7309db.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/583fcce963e6239.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/jhQq9eK/86378963561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_600c28ddbd363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5ffb8a8698d5a.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/hfFiiKv/man_down_rihanna_lyrics_espanol.pdfIn PDF document text
    • https://junezafebu.weebly.com/uploads/1/3/0/8/130874287/7a878297191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5fdf2f30dc47a.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/purivo.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/m9gkejj/tornado_warning_maine_today.pdfIn PDF document text
    • https://pupagabizazupi.weebly.com/uploads/1/3/5/3/135314982/106933.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/pituvevipilusarurazan.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/iighGja/48984227053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_21bfdf36e9bb41d39379edeec10d0eb0.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_d8a75917790c47a686f0ce1ebeced03f.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_7e0d6ee9111a4b9395424a7067766e98.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_120ce9b3d8c4431cb5309203a6003485.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_6a85643b574f47a0bc3b363c029139ba.pdf?index=trueIn PDF document text
    • http://kewetanetoza.atwebpages.com/punolulolij.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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 6184 bytes
SHA-256: df4c5e01789fe96744eded669a9ef0adb274c906c9d275ee327fb6ca538c0a7f
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10284 bytes
SHA-256: 2dba30ba12fba9d28dafc45ba5382593d328904fe99da921f7eab1433b48a05f

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