Malicious PDF — malware analysis report

Static analysis result for SHA-256 a995356cc96c2eee…

MALICIOUS

PDF

78.1 KB Created: 2021-05-02 05:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd515f78eb3b43377be97920e329f91a SHA-1: c84610a281b39a1c2e4a35ea19f497c8f3ec19e0 SHA-256: a995356cc96c2eeedc5ad96201b3afd2878acf14fb7c95c0891c1df9a4ee79a6
186 Risk Score

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 0.9964

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://soxebez.ru/strik?utm_term=how+to+clean+bissell+little+green+dirty+water+tank PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fdae9b945f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_6036d93fba713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_5fd3b44a42e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_600ba89272dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_605aeccca0170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_600090fae6fcd.pdfIn PDF document text
    • http://vezugumak.22web.org/sat_essay_writing_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602eebb83d199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_60194c6d7864a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexixikix.epizy.com/89842044969.pdfIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_a011ae9dcef540389af3f8f08a362b6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/75444084722.pdfIn PDF document text
    • http://gigevowujuro.rf.gd/types_of_allophones.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/jimikivoludizetijaxazapip.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_dbbcd2c34ce947c2a3b82e88cb9565e5.pdf?index=trueIn PDF document text
    • http://fipomazuwasa.epizy.com/siemens_pure_hearing_aid_app.pdfIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_02e65d3407a242fe9b49e630a1e31428.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/is_dragon_ball_super_manga_done.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/zawikojafubagolupamub.pdfIn PDF document text
    • http://muropep.epizy.com/human_computer_interaction_major.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/17644345019.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/royal_navy_pilot_training_pipeline.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/what_are_three_biotic_factors_in_an_arctic_ecosystem.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/rovanikogoretafamu.pdfIn PDF document text
    • https://26c1fd44-f1f9-4ef6-a882-042d00523970.filesusr.com/ugd/e2f197_692d25af753c45afbe0bc347c29a5347.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_111e1e6fe78d45bcbb5256276c004c61.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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 5464 bytes
SHA-256: 9d0d09a41386750ddafdacd97f0ebbbd8b45c05d6f69aefeffe5a27e3421977b
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 10484 bytes
SHA-256: 4e8f76672130851394614bd66a73baa940c6e79b02281eb43f39b1065c487421