Malicious PDF — malware analysis report

Static analysis result for SHA-256 642c5d06161e6e82…

MALICIOUS

PDF

82.4 KB Created: 2021-03-16 08:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f0bd4bd0fe6b335d9cdea53650bf5b7c SHA-1: 2d7a4c90e99e6ffb1ecdae1ce3655b1222006ebf SHA-256: 642c5d06161e6e82b6507579b841b09c4a56c7513312c4367a930cc8664fa3ba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=intellicharger+new+i2+user+manual PDF link annotation
    • http://am-sound.ru/griswold_inn_storeeci2y.pdfIn PDF document text
    • http://biomanua.website/wonder_woman_bloodlines_freeob0oo.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/hAzjgie/jagenazujagebepuwolibasaz.pdfIn PDF document text
    • http://zavodtriumf.com/75817910187g85mw.pdfIn PDF document text
    • http://podjem2.club/anoscopy_procedure_note_templatepcaky.pdfIn PDF document text
    • http://lyudi23.ru/how_to_repair_windows_10_boot_from_usber98h.pdfIn PDF document text
    • http://vilopeg.xyz/vapifufuvipbblpe.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/jijICgj/53959950413.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/8294263.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/iiNGRjg/jutapuzepa.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/ghrihi2/rejamusogumi.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/2306147.pdfIn PDF document text
    • http://site-shop.xyz/99092537287pdvt4.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/ebe3c133-f2e4-4a2d-bdaf-d67ffda5ca5c/mississippi_learners_permit_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a347381-9fe1-464f-9d2a-b5d9e72d74ea/53836199240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa69804e-0972-487a-8876-e975625e0329/bob_evans_sausage_egg_and_cheese_biscuit_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbe228a-69ec-4482-815e-1d6b2f202fb1/the_little_white_horse_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a0b8db-6794-4c5a-8a9f-821123d3c45b/naxabujuzolosuvejim.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_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 5376 bytes
SHA-256: 54d841f4022f89ef2251a35c93fbb6bdc40ea9f3dc6a5deaba8eb745f25d38cb
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 11144 bytes
SHA-256: a06acbfd8851c2f3153735e9f48b946dc0aa158ec732edd9afe9bf86fd1d4e31

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