Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8caf151d3bdcfa8…

MALICIOUS

PDF

98.4 KB Created: 2021-03-19 05:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9359f051b71b98858d27093e114c9235 SHA-1: 284203e7dad65ea813edc2ee3635b7a01694d396 SHA-256: b8caf151d3bdcfa87f3cbc3b5cac21e0dea15c6016d249fccde21041f88ba50a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a link farm, with one primary URL pointing to 'zajinet.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/award?keyword=tutorial+dreamweaver+bahasa+indonesia+pdf PDF link annotation
    • https://cdn.sqhk.co/legezuseg/ibij7pH/holy_spirit_prayers_of_intercession.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/Ubhfich/early_game_guide_summoners_war.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ff27c764631c.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/lTih2ii/rujijemupamizilir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fd93bc81e389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff2056584c64.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/vjhw80p/duvem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fd7a0a12be83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_14a3773a9c464103bfea78d0239fab42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legesiliv/mosut.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/how_many_appliances_can_a_2000_watt_generator_run.pdfIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_8c605399ed3d49fb86a0a16d18414f27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokudapele/windows_10_1909_power_plans_missing.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/how_are_you_feeling_today_answers.pdfIn PDF document text
    • http://dimafox.epizy.com/ambarsariya_suit_suit_song.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_373e65756c314246b998e060b03c6726.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_046ee0acbba44e358898cfaa42e4d516.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_1201a51d7dfe46739c51f5cfb05e539b.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_ef99fa286e6944c39ce603d857a72e96.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_921f28396de94282892e95cac6173da0.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_5738b6e54a1a46929aa952666012720c.pdf?index=trueIn PDF document text
    • http://dozonexupiwef.epizy.com/7912999609.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 5404 bytes
SHA-256: 0ac90026310b2aee893dfcd572e5a5438a7eb08bb62e5e1b1533eeebafd7d918
font_01_sfnt_off000146b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B2 11484 bytes
SHA-256: cfdb39f43ba73a075ba62ebe0ab881947d31404069ce7fa1b7ac35b658428a89
font_02_sfnt_off00016dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.