Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab4a1a2cd12570e…

MALICIOUS

PDF

79.2 KB Created: 2021-04-14 10:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b040c57d17712aac09c97cc646d423df SHA-1: 4f0dc1c6f10ce8a9bcd05eb2996900b006ab9639 SHA-256: bab4a1a2cd12570e17c35dac1d2bd4078f3acc68cb834cc53ed00afc358c06de
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm, suggesting a malicious intent to drive traffic or distribute further payloads. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a high likelihood of malicious URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=how+to+use+a+george+foreman+grill+for+burgers
    • https://cdn.sqhk.co/duputokodoz/rDkihic/51427196193.pdf
    • http://wexexazemulo.iblogger.org/double_down_meaning_in_chinese.pdf
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/9372985.pdf
    • https://tutowori.weebly.com/uploads/1/3/5/3/135317166/veredisi.pdf
    • https://cdn.sqhk.co/vunalogivefu/Z0aiahh/sharepoint_2016_knowledge_base_template.pdf
    • http://dujerewogirovok.22web.org/47243036167.pdf
    • https://noxurawikatiner.weebly.com/uploads/1/3/1/1/131163986/megobevozelixig_kaxelixorot_sojojokisug.pdf
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdf
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/winebiji.pdf
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/xadapopixug.pdf
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/c3512f8db.pdf
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/zagimot-zekomub-jeparurimo-wufufil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vuwejamadadodi.epizy.com/geek_out_game_answers.pdf
    • http://digegaleviverab.rf.gd/tetokinizavexepesadib.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_013d21b15e6c48308fe1344843fc6fe4.pdf?index=true
    • http://kapifotezuxevup.epizy.com/67106704320.pdf
    • http://ragomoxos.rf.gd/lesax.pdf
    • http://bopexetosezulav.rf.gd/ripufawuregavi.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_b1a559b0663c4e45b932fc6bd2bd33c8.pdf?index=true
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_2eb5830c46e04c0fa686bc145b6f84b8.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_2a427f480b594cfa8dc058fd3be69c8a.pdf?index=true
    • http://nixipidulateva.rf.gd/biochemistry_text_book.pdf
    • http://mepalobes.rf.gd/how_to_adjust_volume_on_fios_remote.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_off0000f916.bin
424bfdc24d8031184356ee3d2869681fbef51253c526c39ce284719a01e57b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 5280 bytes
font_01_sfnt_off00010b06.bin
f93168ffc199736077da4f86277022982a5a34671ca37016331174482d438d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 10648 bytes

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