Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54a00c6ad2b261c…

MALICIOUS

PDF

91.0 KB Created: 2021-01-30 14:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ba2f334d774c9d12a1f7c8d50d83ff81 SHA-1: b1c7f9246a30ee6fcf1abf06b500a0e8517da421 SHA-256: f54a00c6ad2b261ce1ddae643d58dcfab9ee1600c5bc271a34056db85a895389
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1553.004 Mark-of-the-Web Bypass

The PDF document contains numerous external URIs and is flagged by ML classifiers as malicious. Notably, it includes an instruction to disable security software, a common tactic in phishing and social engineering attacks. The presence of multiple disposable domains and link farms suggests an attempt to obscure the true malicious intent and evade detection. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://maypoin.ru/aws?utm_term=install+android+emulator+kali+linux+2019 PDF link annotation
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/3f48dfa86c.pdfIn PDF document text
    • https://kukefilatisila.weebly.com/uploads/1/3/4/4/134498126/002b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600ca058a8123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fe7e898eaf8b.pdfIn PDF document text
    • https://bakabita.weebly.com/uploads/1/3/5/3/135309819/kujobelemisuv-dusaxe-xipeke-gonadedexanofup.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/xotuviluva-ridinifabukovep-runakipufazijep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417039/normal_5fcddd5504718.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://pabaxekuvo.rf.gd/ecology_symbiotic_relationships_among_living_things_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/bangalore_north_map.pdfIn PDF document text
    • http://fazafowunop.epizy.com/voraridijidufaxisedajag.pdfIn PDF document text
    • http://lebekuwawelu.epizy.com/zepusufup.pdfIn PDF document text
    • http://sofidubanelen.epizy.com/biomedical_scientist_cv_template_uk.pdfIn PDF document text
    • http://femubavavozemag.epizy.com/bhangra_songs_2018.pdfIn PDF document text
    • http://mamotupot.rf.gd/93353273339.pdfIn PDF document text
    • http://sogigadataga.epizy.com/junadarebusumijasaxutode.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 5404 bytes
SHA-256: 2ce4acdbf2038576b959d68915efb918b2429d6226413625aefff3509027c5cf
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 11224 bytes
SHA-256: 751c054fe2bae6f8e09c105c6c409803877d970761d5a404e891b8401089f49e
font_02_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2
font_03_sfnt_off00014ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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