Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe51b1768af6003…

MALICIOUS

PDF

87.4 KB Created: 2021-02-25 00:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 03ae2dc78d884d0517ed473961c31181 SHA-1: 3d4c14e576f7b2a7588b1d66ba453c9e05c254ea SHA-256: bfe51b1768af6003f5e2ba0d289f83df1126d37a81f0e4579b79e263b88e2de2
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of an embedded URI and the ML classification point towards potential exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=great+american+literature+authors PDF link annotation
    • https://metidelesaweso.weebly.com/uploads/1/3/0/8/130813592/deredonaxa_tozafup.pdfIn PDF document text
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/zipox.pdfIn PDF document text
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/valewurine.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/jakogotu.pdfIn PDF document text
    • http://nibelv.xyz/58964390777hnwak.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/2656b.pdfIn PDF document text
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/kagabilegif.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/90713336877.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/jiresog.pdfIn PDF document text
    • http://igme.site/4258676911689npr.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/risekupokob_lifimurobamix_dunazoxelejek_nuper.pdfIn PDF document text
    • http://sakhavto.ru/mind_games_questions_and_answers_tagalog15bv8.pdfIn PDF document text
    • http://yoptan.space/sujavetewilifikedemzwdz.pdfIn PDF document text
    • http://ellmax-site.xyz/physiography_of_south_asia2xs19.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/ragevifesolidexi.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/55686559388.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/duxeke.pdfIn PDF document text
    • https://jorazejub.weebly.com/uploads/1/3/2/6/132695428/madukewivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wekujugom.epizy.com/xigavukudofagonekupefi.pdfIn PDF document text
    • http://borinalujid.epizy.com/89045389338.pdfIn PDF document text
    • http://muwaziri.epizy.com/aia_hk_dental_claim_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 4952 bytes
SHA-256: 3e6df80cced75f703c332a30c211d5be56ae6db66062d1b56ce2e3570d1d1ce8
font_01_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 10424 bytes
SHA-256: 385d148e8d9f7b8a9da7c791e49535aa572134107bde278e8cc432ed1ecf84da
font_02_sfnt_off000141fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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