Malicious PDF — malware analysis report

Static analysis result for SHA-256 43599f7ba70ae515…

MALICIOUS

PDF

72.1 KB Created: 2021-04-01 10:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f618e4ce858682c693edddb26b4060f8 SHA-1: 779d1618011401025ef90387cee8878777096d8f SHA-256: 43599f7ba70ae5156b9d6d0e9902260220003458a9f8510cdb5f996d57000276
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the document is designed to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://vilenefex.ru/strik?utm_term=how+does+loop+and+sense+antenna+work
    • https://cdn.sqhk.co/lizasizova/aiaickq/45571814574.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6047ecdf20c4a.pdf
    • https://cdn.sqhk.co/rovonoset/7orjih8/wood_block_puzzle_classic_for_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_600d8bbccf881.pdf
    • https://cdn.sqhk.co/zavilisuga/fjdwrjf/no_speed_limit_road_usa.pdf
    • https://cdn.sqhk.co/resesexiraf/Igiggjh/pancake_recipe_gluten_free_vegan.pdf
    • https://cdn.sqhk.co/matikefateri/axhhfii/83723282031.pdf
    • http://uaregroup.com/65931398017ivq72.pdf
    • https://cdn.sqhk.co/levowexesu/6LmjfpZ/singing_elsa_doll_walmart.pdf
    • http://bubble1.space/xexuwukqntm.pdf
    • https://static.s123-cdn-static.com/uploads/4375531/normal_6004b545c9dda.pdf
    • https://cdn-cms.f-static.net/uploads/4408352/normal_603e3dee3fd92.pdf
    • https://cdn.sqhk.co/vuwewiwudesi/jigfiez/78300043263.pdf
    • http://wawupamol.iblogger.org/wobasatam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_028b38ce0e174b6d981ebc8d79f45761.pdf?index=true
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_4381299e55404c4e8ca1820fa9f7c59c.pdf?index=true
    • http://tididesonorevo.rf.gd/budget_2019_malaysia_bahasa_melayu.pdf
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_14bf132fe5094dc18a8ed92f9ee71800.pdf?index=true
    • 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_off0000dcae.bin
1e5d0302c71fab731517c646f75fe7e05c6f5ba6045610ec3cd811245bdd9e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 5072 bytes
font_01_sfnt_off0000ee08.bin
f86020c5cbe76521aa5fb2e2796ca183e68eac65fe36782cda40315f60b3de36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 11060 bytes

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