Malicious PDF — malware analysis report

Static analysis result for SHA-256 8634b95001ad7936…

MALICIOUS

PDF

78.8 KB Created: 2021-04-05 10:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0390663f967338896f0f58a05bb604bd SHA-1: e501d2feddbc43d624cf59937aa24b35d406759d SHA-256: 8634b95001ad793605623889b5ef40830dc4539fb797920b319536647bc4e405
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. No scripts were extracted, but the sheer volume of external links points to a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=sample+l1+visa+application+form+filetype+pdf
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/5168816.pdf
    • https://kutoponipikule.weebly.com/uploads/1/3/4/8/134849894/26943ba25f3a.pdf
    • https://cdn-cms.f-static.net/uploads/4479904/normal_5fd6ffdd17595.pdf
    • https://lubawefajisewo.weebly.com/uploads/1/3/4/4/134443910/panegewom_xuwolagomip_xidirajer_pitixowaxakere.pdf
    • https://cdn.sqhk.co/titabofasika/hah8Vtd/bubble_bobble_arcade_machine_for_sale_uk.pdf
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/sobarifo.pdf
    • https://cdn.sqhk.co/kegetaxob/jiiiiie/14361688430.pdf
    • https://cdn-cms.f-static.net/uploads/4428334/normal_60351c46df153.pdf
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/6511432.pdf
    • https://cdn.sqhk.co/gabunufu/Hggdicq/grass_cutter_tractor_machine.pdf
    • https://cdn.sqhk.co/nakunadubux/9gsiYQJ/28087310681.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_4637a61110a54784acc723fd3c033ace.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8c985e53-4a49-4b1c-b656-40b1b15dbc68/34721866041.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_8cc2bd5476994215b2197591e1c468aa.pdf?index=true
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_cdac232ea4e64a1bb56182fc9987e591.pdf?index=true
    • https://s3.amazonaws.com/toguvaju/88765125776.pdf
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_5f66fedc7844411da880fc9d763d4fce.pdf?index=true
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_2d215f94f7c14cb2b53af4ff6848f583.pdf?index=true
    • https://uploads.strikinglycdn.com/files/778d9080-b491-4191-89df-714f7b3c0de1/vuvaxagowojat.pdf
    • https://uploads.strikinglycdn.com/files/bfe6a6c7-af37-40f9-b698-8a98402a4aba/free_activities_for_bear_snores_on.pdf
    • https://s3.amazonaws.com/jamuluvuvava/sportcraft_turbo_air_hockey_table_model_34012_manual.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_off0000f4bf.bin
2d3fc86eccadafadbf25f1a1a95c71797ad583bc2f456d19b5dbc4ff293c5d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5620 bytes
font_01_sfnt_off000107e2.bin
1e58853e7c636a9d06885cd239245cc634eb5af05ea6c616c40efe21ec28e64c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10524 bytes

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