Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2feece8ea14f88…

MALICIOUS

PDF

90.8 KB Created: 2021-05-11 07:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f98cf4fde0e0d05590772c08f28f5d8e SHA-1: c9e779347a07d6db21d2e2b8fb9309e8d5106a5e SHA-256: 8a2feece8ea14f8839b4d5a08f38619b79d80158edf92e3b7ed7484544030dd8
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 of which point to disposable domains and are likely part of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=syd+field+screenplay+book PDF link annotation
    • http://lotukaguw.sportsontheweb.net/podinanoludelefod.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/jemjggi/download_wallpaper_hero_mobile_legend_hd.pdfIn PDF document text
    • https://zumasugi.weebly.com/uploads/1/3/4/8/134864891/zipavevexozun_gafujibego.pdfIn PDF document text
    • http://paselon.getenjoyment.net/vobamolujevelusa.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/60236662713.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/NgfhakE/78520694595.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/pumasufufafaxari.pdfIn PDF document text
    • http://mnclassis.org/revolver_paintball_guns_from_community9mv9c.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/istanbul_airport_map.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/guide_to_elliptic_curve_cryptography_hankerson.pdfIn PDF document text
    • http://x-bionic.shop/93259570014dy4cg.pdfIn PDF document text
    • https://vekadewozume.weebly.com/uploads/1/3/0/9/130969331/2510400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibimom.myartsonline.com/characteristics_of_a_good_project_manager.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_095f5f0bc428495b9535175ed7e23293.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_1c809c05f3ad4cf6a7d91e32a7fee8cc.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_bd4d13e7ab274c798d6ee2b0fec683db.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_29a27bcefe9543318ffe7d9d680c1c05.pdf?index=trueIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/balijejur.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/jupodibobixe.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_cbd48698e30048a88fdd8d646aed93d3.pdf?index=trueIn 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_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 5556 bytes
SHA-256: ed15b5b215008ad3b06744f593bf7ff505ae9d3e1d20cd98e43799279be7bedd
font_01_sfnt_off000136ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AB 11712 bytes
SHA-256: e3e7bc8ed3cf5abb13ebc759efc4c4d094eb7dd66e0977f157e0da982240fdfc

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