Malicious PDF — malware analysis report

Static analysis result for SHA-256 1072eb5294416a7d…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a74ebd7895729358c00c53cc1c25810c SHA-1: 2b94c6d202a86a6b6cdf8467841deaae5e4ed261 SHA-256: 1072eb5294416a7d0124abfcc88094d73c651135aeb5b3ce32cad7e5154dcd73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains embedded JavaScript and a mass of external links, suggesting it's designed to redirect users to malicious sites or download further payloads. The primary URL, https://mezovuduw.ru/award?keyword=mathematical+logic+pdf+free+download, appears to be part of a link farm designed for SEO manipulation, likely to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mezovuduw.ru/award?keyword=mathematical+logic+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4390366/normal_605cac621bc67.pdf
    • https://cdn-cms.f-static.net/uploads/4496381/normal_60223c602560d.pdf
    • https://cdn-cms.f-static.net/uploads/4411682/normal_603ce2d45a6ca.pdf
    • https://jubagidegugidok.weebly.com/uploads/1/3/5/3/135317658/f91edc70ada0c0.pdf
    • https://cdn.sqhk.co/bupabumo/FKfNigG/wudevig.pdf
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/bulekexej_xikiw.pdf
    • https://cdn.sqhk.co/gasosivifug/jaMe48G/free_fire_topup_center_nepal.pdf
    • https://cdn-cms.f-static.net/uploads/4490375/normal_605032411b89a.pdf
    • https://cdn.sqhk.co/pinepopowig/emshgjc/84291962106.pdf
    • https://cdn.sqhk.co/kepesofuxofi/RuErhhW/mivetexasanux.pdf
    • https://cdn-cms.f-static.net/uploads/4420239/normal_60676f9484498.pdf
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5ff0947144ebd.pdf
    • https://cdn.sqhk.co/mujowofapubi/iQhahhs/62493803159.pdf
    • https://cdn.sqhk.co/vewimidipiv/kphahcA/sprint_car_racing_in_florida_2020.pdf
    • https://juvivufoli.weebly.com/uploads/1/3/5/3/135325295/nolemilu_loxuberiz_meput.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bomupi/memipajad.pdf
    • https://s3.amazonaws.com/ziwuvijevo/cuadro_medico_asisa_valencia_2018.pdf
    • https://s3.amazonaws.com/xeroguru/yamaha_rx-v373_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_off0000f5ec.bin
1650931761d28c54018dbd4bdda00d31723cda6e601b3fb30583baabcd0c781c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 5488 bytes
font_01_sfnt_off00010890.bin
bcf756daf3419928f737d4ab276b41bc4c55cce37196c1601acad11525739846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 11376 bytes

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