Malicious PDF — malware analysis report

Static analysis result for SHA-256 c495e2d590a67588…

MALICIOUS

PDF

84.8 KB Created: 2021-03-26 18:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3eec601ef45eca511b9eddaa0ccb96fb SHA-1: 8f6c37e70ce405bacd767f3b1e43667fa4a0c00d SHA-256: c495e2d590a675889f8e6cc27c05123d7d60357cdf095c41ac4b3efef3570e3b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/123?utm_term=blue+valentine+movie++filmywap PDF link annotation
    • https://cdn.sqhk.co/nobixapo/chiAgU1/16795208812.pdfIn PDF document text
    • http://lorezagosuvese.scienceontheweb.net/concept_of_budget_and_budgetary_control.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/healthrider_h90t_treadmill_specs.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/bumadapepim.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/icQggc4/seterexinepowi.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/mrhiJuY/spinosaurus_aegyptiacus_2020.pdfIn PDF document text
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/680213.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/livre_de_conjugaison_anglais_franais.pdfIn PDF document text
    • http://revopuvazoxine.22web.org/ecology_of_the_planted_aquarium.pdfIn PDF document text
    • http://visojafuzotubez.22web.org/algebraic_proofs_worksheet_with_answers_gina_wilson.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/ha0sLtD/48615288703.pdfIn PDF document text
    • https://tovisasuwuvep.weebly.com/uploads/1/3/4/5/134513775/gawumazoz-zutukeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ac2b94-87cc-4024-ab71-53f69c7f06dd/19838577315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0724ad2-c4c4-480b-aea7-27af7ef45977/75746242540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3310aa9d-4000-463c-b746-9dabc9fc2c93/how_to_bleed_air_from_floor_jack.pdfIn PDF document text
    • http://tereneduzoz.epizy.com/worofojil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a47e9ae-602d-447f-b16b-22aab85be2e9/jixolikaralupunejudus.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_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 5076 bytes
SHA-256: 580a0ada051fb0f87fd161eaac353f32e05bbb510846409ba4e5ad9a909939d6
font_01_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 10916 bytes
SHA-256: d54a95e49c7ff1df3e6efdfddd2a42e9e682645d61e127102b391a69645951c8

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