Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ce076f6a4b59b…

MALICIOUS

PDF

83.3 KB Created: 2021-06-02 07:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 22dc659350f49b69dde1ab7c920f6ae5 SHA-1: 116125842b47b4fc8520e6eb7126cde4d752a1d2 SHA-256: 751ce076f6a4b59be1097693b8fe1b179286cc5c8002b49a722ba0bc863e799f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'garglob.ru' that is flagged as unknown. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/pbw?utm_term=big+ideas+math+answers+algebra+2+texas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449004/normal_5fdf34a96200e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2de46f2827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_606e9024295a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ffebfe66ea34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5ff555cdd73bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcaab5b-c09d-4ac4-98a6-cf1a75665bdb/angle_relationships_in_circles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecba9ff-9e59-4cbe-8b6d-edadd7639938/jitukedasos.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428940/how_to_use_my_proform_treadmill_without_ifit.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/xugukewidinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d619e1f-2f88-4af0-ab18-62deb7a092fc/wobovabogamenasazemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9214d8bc-c916-4a8c-9725-32776a0e8964/14764436237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d68c141-591a-4212-93da-f986fd9a47f3/39191156803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88481f6-61fa-4202-8ec1-6866aad1e157/wekavik.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/25000109230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263e4ca3-4f18-4197-80a4-57dc8eff7e1b/the_adventures_of_sherlock_holmes_jeremy_brett_full_episodes.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144452544/5226154543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88de77a-7c25-4145-bcd9-a25ff7b23bf1/98470384993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e01099a-923c-4c95-8baf-2fedeaf8be35/gepelanoremoligagerek.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/30983615574.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144485202/zogubasozi.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_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 5720 bytes
SHA-256: ddd7b391ec9789baae94784afd25044b202eceb3a110fec4f463da28b9ecf771
font_01_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 11960 bytes
SHA-256: 5ee79857d30beb2fbb7c049775ba2b640189dffd640090355908692cd155b47c

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