Malicious PDF — malware analysis report

Static analysis result for SHA-256 8754824e04aadaf6…

MALICIOUS

PDF

70.3 KB Created: 2021-03-29 19:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4991c849eb11a87cb1a39b76a8afa601 SHA-1: bbf9c3c5385776291c9ece79c9aee5b0db6cad6b SHA-256: 8754824e04aadaf67d7bd4a6bce91138eab381eb05cd98f273e2aff783c5fe3a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=car+background+photos+free
    • http://vitetoka.scienceontheweb.net/zikib.pdf
    • http://xevusezes.medianewsonline.com/building_construction_ppt_download.pdf
    • http://vuwefedope.sportsontheweb.net/nawadalemevilukubowifif.pdf
    • http://wiwajekirutiw.scienceontheweb.net/gejikojumuxuzojona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kipejefanowisu.atwebpages.com/93009632786.pdf
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_d1af8251effb48dfb0e23f6c604ce0aa.pdf?index=true
    • http://nowageg.onlinewebshop.net/nivamevubakupudofuxeli.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_ee131c712fc64e9dbea21494be063332.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_450eeb266271415f84801e34f13bf9b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/389a7bc6-b48a-4c93-9fa2-bd111561efdb/how_to_cook_farro_in_zojirushi_rice_cooker.pdf
    • https://s3.amazonaws.com/zerepuzuze/evacuating_london_narnia_piano_sheet_music.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_a47fe4b782b6491b8bc294d0922661d4.pdf?index=true
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_f59e78ed29b245c78c96643b903bdd3e.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_dc7bb48cb9f34d1f84f5d7a8af25d42c.pdf?index=true
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_a3817753c2424a8e8f04d1b32ef4ac43.pdf?index=true
    • https://s3.amazonaws.com/xijilesuzuxo/laketudolizavofuwif.pdf
    • https://uploads.strikinglycdn.com/files/f6dd1455-f223-42ee-b24d-a109144e3d01/31918421228.pdf
    • https://uploads.strikinglycdn.com/files/aab492b9-b256-4ad4-8fe9-4a1cd3142452/sample_treasurers_financial_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d686.bin
bb7c6d93539c7b45b9ae0d00b1824dcf86307cdd20b57a622760147d26ea3fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 5496 bytes
font_01_sfnt_off0000e92c.bin
7b09bb177da17aaa29ce49d8fb8ad265df26e6216a91b8f76b79cc1e37d40040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 10188 bytes

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