Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1b2ab61673afab…

MALICIOUS

PDF

89.6 KB Created: 2021-03-01 00:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5f10d5f85e143b5066b355feef201d4e SHA-1: 02bb8ed6e258ab2d174f40b3a057f58548491c2d SHA-256: fb1b2ab61673afab7845a38f445c4d2eea582fb4dd88194a4ced8c2fcd03c8d7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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://botokaw.ru/123?utm_term=asus+rt-ac88u+router+review PDF link annotation
    • https://cdn.sqhk.co/pekotegafod/ljihbFi/foreign_affairs_magazine_customer_service.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/sinejugusadizuxulufe.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/7692732.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/fios_quantum_gateway_router_speed.pdfIn PDF document text
    • https://cdn.sqhk.co/ripigopes/ggjhXjj/50726891391.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/hii34ia/diy_medical_face_mask_no_sewing_machine.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/15f9a53.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/hf70gex/gujudolapi.pdfIn PDF document text
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/3584124.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weparaxopulo.atwebpages.com/20944042654.pdfIn PDF document text
    • http://zukuvib.rf.gd/evacuee_identity_label_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/tevumigaxofexo.pdfIn PDF document text
    • http://bitinorakinin.epizy.com/imf_report_on_guyana.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_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 5128 bytes
SHA-256: 1c87148041586980902e4948a10918a022bcd819a8abd6d71afad28f21dafb48
font_01_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 1880 bytes
SHA-256: 08d4f81f0daff4449c1abe5c06fc2aee4a52920d707249e9ac396032166b5261
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 10548 bytes
SHA-256: 7dfbbf436326ca6a4f273e6380f14f8dd1f979a465ebbe501563915ad4d4116e
font_03_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 16508 bytes
SHA-256: bf0029f2f65a8d03fc5bc6dac3f89872448ee76276b38fcd79a4881ba082e330

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