Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb4904c4d851fcc…

MALICIOUS

PDF

78.8 KB Created: 2021-04-07 07:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b3847e68240675bd02812afaa3a614 SHA-1: b36df126541ea94a2d96a096880bc30a6e6cb57d SHA-256: 7bb4904c4d851fccaf39124389efc8171dd9ab31c8a13006ef85fbcb1ce6ca8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious or deceptive websites. The document body contains metadata related to its creation, but no direct user-facing content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://resalured.ru/wix?keyword=stuber+review+parents+guide
    • http://dupamineni.medianewsonline.com/corrugated_box_design.pdf
    • http://jisuvakuwiraza.medianewsonline.com/8086_instruction_set_and_assembler_directives.pdf
    • https://cdn-cms.f-static.net/uploads/4472501/normal_60303ce218443.pdf
    • http://xofebuledat.scienceontheweb.net/silovujutupotitenuvojo.pdf
    • http://tometifo.getenjoyment.net/agenda_docente_2020_para_imprimir.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6021ef74715cf.pdf
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5fee6952a85b6.pdf
    • https://cdn-cms.f-static.net/uploads/4490757/normal_602dd74179c59.pdf
    • http://fepaporipevari.mypressonline.com/altistart_01_manual_espaol.pdf
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fdf600ab9923.pdf
    • http://wuroguredogir.getenjoyment.net/bekafobegez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sogivuwe.onlinewebshop.net/xufolu.pdf
    • http://widusop.atwebpages.com/21453924732.pdf
    • http://reditavipesef.rf.gd/list_worksheets_in_excel_workbook.pdf
    • http://tameladizikep.atwebpages.com/meridiani_mondadori.pdf
    • https://s3.amazonaws.com/zidenigad/kajavoponibevijopimin.pdf
    • https://s3.amazonaws.com/bezutu/8559079448.pdf
    • http://wuvasof.epizy.com/xusataw.pdf
    • https://s3.amazonaws.com/laginekux/how_much_do_associate_degree_accountants_make.pdf
    • http://dasajixuluzabid.rf.gd/89725369956.pdf
    • https://s3.amazonaws.com/dutimajizowa/one_of_us_is_lying_character_analysis.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_off0000f3d1.bin
523cbd3321a8c7d7388e5bffe228df35492cca3222599893058c9281c221d3b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 5488 bytes
font_01_sfnt_off00010691.bin
6d6f6b19ddf6633a6ca1fac3b7da17543625208670188fb885c5b57703b362a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 11136 bytes

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