Malicious PDF — malware analysis report

Static analysis result for SHA-256 9253439fa99df328…

MALICIOUS

PDF

73.5 KB Created: 2021-06-05 12:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 336e2d4f144648f207485614c3a2836d SHA-1: 46987e05ff406559a6366adf513cd6ff6274b8e7 SHA-256: 9253439fa99df32892967ce0e23701dfa306647f8d2bffff42146997f32fbbec
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, with many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://garglob.ru/pbw?utm_term=management+information+systems+for+transaction+processing PDF link annotation
    • https://timurikamaz.weebly.com/uploads/1/3/1/4/131406182/dejore.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/701d77fbf1d1.pdfIn PDF document text
    • https://boxakowomer.weebly.com/uploads/1/3/0/8/130874011/9958284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463306/normal_5fe4c43d81eff.pdfIn PDF document text
    • https://lajonomopizu.weebly.com/uploads/1/3/0/7/130739457/353667edd7742.pdfIn PDF document text
    • https://telutifezidawu.weebly.com/uploads/1/3/4/6/134624569/welimokoxogizemimiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5ff692e063400.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/8d68ecd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468814/normal_60b423bfc1fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_604351fd768de.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/gufogunij_pazuvurowegam_tupob_joxazerojarexov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_604667789cd48.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/karopasebowopud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417403/normal_602a171def910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_60622bf921a7e.pdfIn PDF document text
    • https://sejomuxajifaged.weebly.com/uploads/1/3/1/4/131437693/tupibiv.pdfIn PDF document text
    • https://vujoxakot.weebly.com/uploads/1/3/4/3/134318531/kitebuteb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_603af49547d0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_604dd6016a1a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosajivapesi.pbworks.com/f/gexogotip.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144647391/irinler_izgi_filmini_indir.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/w/file/fetch/144609996/nobavomemedizo.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144610233/reading_comprehension_activities_for_3rd_graders.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144515907/how_to_operate_boiler_in_ship.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 5408 bytes
SHA-256: b8e76497bbcb9728b7856d698855e42535632c8ebfbfe44204fa7bb8796f0df0
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 9772 bytes
SHA-256: c770ef4dad4a7d28826f6691cc8410c1eb121242f8029eaddb8bdf53d992aed4