Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a0d0cbd5d75f97…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 17:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 113925b65e2859274e4a6136dd5cdea8 SHA-1: 276dd8ed2869a90a1e02f01d8bd5360907b31dca SHA-256: b1a0d0cbd5d75f97fa13655a99d2e2385765e2cbc96753f865cab3841e3568da
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, with a primary one being https://mezovuduw.ru/award?keyword=answer+sheet+pdf+sat, suggesting a phishing lure related to an 'answer sheet'. The PDF structure and embedded links indicate it's designed to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=answer+sheet+pdf+sat PDF link annotation
    • http://idealica-official.website/garmin_forerunner_405_change_battery4mhcm.pdfIn PDF document text
    • http://korecos.ru/what_is_knowledge_economy_in_sociologyrbnqi.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/50763114480pphcj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_603f4d2aa8efd.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/90Jbgj0/nfl_network_app_roku_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_603c0bd9c7340.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jsPhd0F/17439148387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_600ea7184f3d5.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/fhgihgh/80823764376.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/gchfNji/the_greatest_songs_of_the_80s.pdfIn PDF document text
    • http://slamelina.website/not_your_mothers_rulesmayy9.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/dhp0eQc/wojejazurenufagoliv.pdfIn PDF document text
    • http://masajsalonunuz.com/45360793584fj6r3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_aecc2338a5db431c923218662e628211.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/34300701195.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/32509526715.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/adobe_audition_cc_apkpure.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_6087b4e578de47ea864f21df8cec4881.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/rijidet.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/popstar_never_stop_never_stopping_best_songs.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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 5180 bytes
SHA-256: 6d1c2f2c0e89fbc46583e2f6a5463e8fa1fbb2fe8b1535bcf4a700393210c643
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10760 bytes
SHA-256: 3ace4f90ff66247b514f8b96a574066c278d95d7952a7e9ddc7a6f99687973dd

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