Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0b76b20121d5b0…

MALICIOUS

PDF

91.8 KB Created: 2021-03-24 16:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 49723d9f04c463da23f14f617c1eef98 SHA-1: a913098af14a37a98443613ad95a577ed2a455b8 SHA-256: fe0b76b20121d5b097a064298124d486c617350e3635a424612550c456436afb
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, with many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links and the document's deceptive title ('Centrelink online account guides') point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=centrelink+online+account+guides PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5fe94004bccc9.pdfIn PDF document text
    • http://center-about.com/pogil_photosynthesis_answersxa9fc.pdfIn PDF document text
    • http://my-credit.info/zozalunenobtpsr.pdfIn PDF document text
    • http://topvideo.design/maytag_bravos_washer_take_apartki11t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6054c6d72bcdd.pdfIn PDF document text
    • http://nakanilo.club/tigolozodenabemye9zr.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/66821532449wwvpm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_e1342b89a25d4ce9a956f268c128b6ff.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_9a2c46f8af5849929aa1bf1b71374635.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2b2282-431c-48fd-8977-a7321545f7d5/what_is_the_most_effective_antibiotic_for_cellulitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497fe92a-27b9-42e0-b0d6-c8c9f6f6ff8c/gedujadelimefixe.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_5092987bc7a84f9d9d1a5ee977f5f3b0.pdf?index=trueIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_2aa838e53b144602a1be08df3fc9e518.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d9d3e1-1cad-4753-831a-89c3ae4f6793/30595426014.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/vilokisusoragabajo.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_f93c3a23655a4ae29a2c84bdd1916c4b.pdf?index=trueIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_98a5823ddcb34ccfaecbc70420da0f51.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_844208f693e04a67b68d33272e1c3a41.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_686f2709e2e749d9987392d1d98bfb96.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_382c5a494ef347d99056390061d32525.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_52df8ddf0a7d4067971b0502fddf0d2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibitexil/57186149295.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/the_kjv_cross_reference_study_bible_womens_edition_indexed.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_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 5076 bytes
SHA-256: 09444142a32a6a9229a293a55da30544f5a7890c4351e7ac6b71c95a3576aa7d
font_01_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 11312 bytes
SHA-256: 79f12648c478fcf7801f4c9278bac5a07a16fabacbb28177fc512a40de638ff3

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