Malicious PDF — malware analysis report

Static analysis result for SHA-256 41473dcb7bc5e7ee…

MALICIOUS

PDF

71.2 KB Created: 2021-04-06 06:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 68cb569961cfa4cc8d07128094e436df SHA-1: 264f775d929dfe70b63c56d23760eb326811c364 SHA-256: 41473dcb7bc5e7eeb8fa8b81c744df72fe7231e175920309e305ab89c47533a3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute or redirect to malicious content. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=smc+compact+cylinder+catalog+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484818/normal_6019f2310de32.pdfIn PDF document text
    • https://cdn.sqhk.co/fotezuvori/SjcijeH/cosmology_vs_astronomy.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/gXgdgh2/63735589234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_60485353a1893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_605d6eedeafc9.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/gcghia4/xbox_series_s_vs_xbox_one_s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fd1988918569.pdfIn PDF document text
    • http://sebokuxaxugu.iblogger.org/how_to_help_your_dogs_joints.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_6066dc83dc7bf.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://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_d002d6a4a1ab41d0b3169ec357fbdade.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_714ffbe7187144189c4a42bbfa48ed4e.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_d4a5c674eb194c428c92b6499286338a.pdf?index=trueIn PDF document text
    • http://todetizos.epizy.com/55004405462.pdfIn PDF document text
    • http://wazisosixi.epizy.com/active_voice_passive_voice_exercises.pdfIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_7955c7adbd9c468aadfb0c29aa3af90b.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_1a6c9c1b774a48e5b52a3518f0bfb56f.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_8b15c7c11bcf468493d3985286d34b16.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_c6714041419345e2b28c5361c6bd85ff.pdf?index=trueIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_388e1a96e0c349919dcc6085976b16cf.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_80438d41797e4732a914dfc145e977c6.pdf?index=trueIn 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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 5292 bytes
SHA-256: 3696c4a4ac2fd5965cff764f8ed226b7abb44084090bc9d15189171caea6b42a
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 10392 bytes
SHA-256: 561ceb243154c3d68067c0437c2317addaf9ecc1ca024b5a8218688045dde25b
font_02_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34