Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8b1ee588245290…

MALICIOUS

PDF

81.9 KB Created: 2021-04-07 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 08e7bd51907bb88239b1c19ac82d8c22 SHA-1: ed2dbd05b04802e87cf004166ab959bf782d6a28 SHA-256: 9f8b1ee588245290e14431f4b18942e18a76df7671bd1c41dcff856ac7b91fc9
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although the document body is heavily obfuscated, the presence of the external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/123?utm_term=how+to+delete+voicemail+icon+on+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488810/normal_5fdc1244d8bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_603763755c5b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5ff32a4b5d8df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5ff241385fc48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_60095e5e4fe46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_6029b10176e60.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/i1ijvii/highway_moto_rider_traffic_racer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/dlziiZT/23417545447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fc693b136250.pdfIn PDF document text
    • https://cdn.sqhk.co/fusifanux/NTichiz/48927785543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fd24287b7681.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.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://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_16c1aa3bed644fbe81026c292e30a218.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdbd5af-4dea-4a89-8451-7a4c75f57c40/sony_a350_camera_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919e5eb1-9636-4821-8e06-179dd8daafaa/93481573924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b895805f-fbb1-4c76-b3a3-a57b3467a6b5/craftsman_675_series_lawn_mower_oil.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_e3e915c8b71d447e88d5491286a242a9.pdf?index=trueIn PDF document text
    • https://869e45c2-9c2d-410b-ad52-4d3411d41339.filesusr.com/ugd/73bd41_45d7f929d9e54927aafa9a0355d5b96b.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_3acf5c779eae40529bae474022302d9a.pdf?index=trueIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_874d5dc80b21429ea04ad3f6f1169d87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f042fa-2c87-4f50-941a-8c00b7ffd534/50203091193.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_7bac6bb7a7104ba09f9e88eaa1ae1624.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e888042d-a3b1-4d91-bc7a-233c697998c7/what_was_john_dewey_known_for.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 4808 bytes
SHA-256: 712baef6b6eaa2125ba9a98834873ce4e450743eccb57c28115d2a6689684147
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 11208 bytes
SHA-256: 890e35e1c520c5d3adfa8321bbf3a794b1ab4322b2af86d55fc7e5ce581894b1
font_02_sfnt_off00012bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361