Malicious PDF — malware analysis report

Static analysis result for SHA-256 256becc097f1e472…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 16:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ce21d23c9f82bc528c0a3bae91bc98e SHA-1: 5a324257c486000d2f9cd61dc2bd7456786801c0 SHA-256: 256becc097f1e4726de3e08b97aca94646c704b71009f78086fb53d14e12e495
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xajibur.ru/award?keyword=di+pasquale+anabolic+diet+pdf PDF link annotation
    • https://cdn.sqhk.co/kojetozativ/AbDSih2/wovevavarixixazu.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/bPzTjbE/277539979.pdfIn PDF document text
    • http://zanakodus.22web.org/kuxotefirisevaraxeb.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/jegijew/26389139366.pdfIn PDF document text
    • http://nulonelam.66ghz.com/rilasozapavasonapamakan.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/5iahiBy/romal.pdfIn PDF document text
    • https://cdn.sqhk.co/belerudoxej/hfHbeih/chemistry_matters_textbook_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxuritodapeni.epizy.com/kosububabulibunedipub.pdfIn PDF document text
    • http://jikokajogov.rf.gd/78805917102.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_cf173cefa60f4958b3f8355d8fbc46b2.pdf?index=trueIn PDF document text
    • http://popeladidet.epizy.com/verbal_reasoning_questions_and_answers_11.pdfIn PDF document text
    • http://juguxawe.rf.gd/71282746595.pdfIn PDF document text
    • http://duwosemomim.epizy.com/nivolanoxenudafinaw.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_b4ba2b3a45f243f9877c25f62be41ebe.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_4aa6d9b55955475a8674f0c8549aa7d9.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_2c605705efdb4c99904815949831a9d1.pdf?index=trueIn PDF document text
    • http://rubuvajaroxe.epizy.com/brooklinen_luxe_core_sheets.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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 5316 bytes
SHA-256: 37ce17c6aa5db91fb95d5f9560e4b1620cfe59832fd06596d4f7fbd7381693db
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 11800 bytes
SHA-256: ebf6015899077d5235da4a9eefa41b78490b6603f561843001d0668d1e888bc3

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