Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5307ceb3f86ca27…

MALICIOUS

PDF

73.0 KB Created: 2021-02-19 22:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 95c5b2c94163a730156577b0ae664d60 SHA-1: bc420a05a66477628ef9b3fdec94f496d2c8da9a SHA-256: f5307ceb3f86ca271cf6bb7b9d4c30f75a95551160d337891be32872007a7124
226 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, embedding a large number of external URIs that point to disposable domains, likely to host further malicious content or phishing pages. The document's structure and the presence of numerous suspicious links indicate a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=is+it+easy+to+get+pregnant+at+26 PDF link annotation
    • http://zzzmmmmejjj.space/a_level_maths_vectors_questions_and_answersnip95.pdfIn PDF document text
    • http://managerprogram.live/15514560885b0s6p.pdfIn PDF document text
    • http://vezerfa.xyz/36852917925yb9ex.pdfIn PDF document text
    • http://fdvsefwfrw.space/jafupalagajupdl2f.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/jojjfGN/3484451584.pdfIn PDF document text
    • http://businessmentality.com/por_el_placer_de_vivir_con_csar_lozcl5ei.pdfIn PDF document text
    • http://kinorio5.xyz/14719604234kem3o.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/hehdhdB/pivideline.pdfIn PDF document text
    • http://pet-guru.shop/412177796316fqz5.pdfIn PDF document text
    • http://banquepopulaire-fr.org/afficher_les_formules_dans_excel_2016mr9oi.pdfIn PDF document text
    • http://fruittea.space/fractions_addition_and_subtraction_worksheets5tx5z.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gCLZTJs/geporefosugokorezalalob.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/pimulemu_berojudob.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/fgd3qVr/pagikomuwebitamaresow.pdfIn PDF document text
    • http://trysucre.pro/xumajodoserewulilexulog9ski2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 5280 bytes
SHA-256: 9b5b5a528179c20158c4e29b586c3d3fae9e9f866fe4c0be368fb31b18d44f19
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10256 bytes
SHA-256: 0daafcb345056e24ea2915c81dd14cfb17e424400ca31b8286c95fa7b96399ee

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