Malicious PDF — malware analysis report

Static analysis result for SHA-256 4773c85a4b256964…

MALICIOUS

PDF

81.2 KB Created: 2021-04-23 02:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80917a728d8044db79c7a4149dad7f79 SHA-1: 6f9690bb815d1f27a9f8e7243492dc07a2c91244 SHA-256: 4773c85a4b2569642b4084a085d915211b493fe8014249ae7bf03a339419b7be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=c%252B%252B+data+structures+and+algorithms+tutorial
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/raxuzave-jadoje.pdf
    • https://jubekese.weebly.com/uploads/1/3/1/6/131606730/zamixojabizebimok.pdf
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/1293416.pdf
    • http://lalabomujulimof.mywebcommunity.org/business_development_associate_interview_questions_and_answers.pdf
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/5105658.pdf
    • https://cdn.sqhk.co/jabuvilir/VZijhd3/2010_dietary_guidelines_trans_fat.pdf
    • https://cdn.sqhk.co/vadetegubufo/e77ifjh/door_kickers_coop_how_many_players.pdf
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/janegakis_lidimuzavizofex_berorik.pdf
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/2275303.pdf
    • http://miraluvofizobe.medianewsonline.com/is_nqf_level_6_equivalent_to_n6.pdf
    • https://cdn.sqhk.co/posojuvapono/5zg5gfb/tiktok_songs_2019.pdf
    • http://mamafiposorugul.sportsontheweb.net/wilugudosef.pdf
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/2477694.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nekepozime.epizy.com/free_counting_coins_worksheets_1st_grade.pdf
    • http://dokudaruriwiv.atwebpages.com/4778287598.pdf
    • http://mipolerabafobe.epizy.com/bodybuilding_anatomy_chart.pdf
    • http://lupibewexuzu.rf.gd/55122929215.pdf
    • http://dugerem.atwebpages.com/45873553948.pdf
    • http://valamujunitun.epizy.com/52018072146.pdf
    • http://misukejijixuke.epizy.com/76700882556.pdf
    • http://kavezusi.onlinewebshop.net/70793679830.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f180.bin
eb7aff695a4353c523ee810ebcef75be1152c258920887d1cdb7625ae91aae3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 5260 bytes
font_01_sfnt_off0001032c.bin
2ed38a7ffb58095a1fabc06437fb265c31ffe31f5e76f886d6c3bfde703a11e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 11272 bytes
font_02_sfnt_off0001293e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 4324 bytes

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