Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d163bcf5edcbce8…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 10:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3605e7f72d5fe63d8cd8ee937e7d5d8f SHA-1: e1e92c295c53718bf24056a082b00b2fafb1711c SHA-256: 9d163bcf5edcbce87d3c2dee5b57522957df6d645a734eb55e6e47f30043b10a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/123?utm_term=best+g+shock+tough+solar+watch PDF link annotation
    • https://degobevotu.weebly.com/uploads/1/3/4/3/134393677/a8e35f95db.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/1837283.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/jihEjif/88008948913.pdfIn PDF document text
    • http://tehnotop.site/90079673611iy3zz.pdfIn PDF document text
    • http://vinnipoh.space/28010117961gy61q.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/wrong_turn_series_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/bodegife/PNzqiiv/797862698.pdfIn PDF document text
    • https://gugewixurot.weebly.com/uploads/1/3/4/3/134393699/ginozevenilakadolu.pdfIn PDF document text
    • http://shoop-fm.ru/79941064857ym396.pdfIn PDF document text
    • http://liporolo.iblogger.org/xeluxivarafepozoxapupes.pdfIn PDF document text
    • https://cdn.sqhk.co/vejanozugova/hIgdibi/retro_racer_cykler_til_salg.pdfIn PDF document text
    • https://jafukixago.weebly.com/uploads/1/3/1/3/131380625/kepufixujujatujelesa.pdfIn PDF document text
    • http://cookwellbakewell.com/cheat_engine_6._3_for_android_apkjsfau.pdfIn PDF document text
    • http://anarchymedya.com/92049295997vkhs6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/kegagari.pdfIn PDF document text
    • http://gaxegumulot.rf.gd/palosapebu.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/vunexojejojivabawir.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/broadside_array_and_endfire_array.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/55510114812.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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 5264 bytes
SHA-256: 4f189108dd7dcf2b408f767b93030d0df0d533123fb2b40ab6bd133315bba792
font_01_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 10624 bytes
SHA-256: e7d62075364ca2133dff50b021810027a927671ff7655e1287af1de38275b18c

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