Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da1100bc54c2e8…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 22:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cff698fdad1dfb199f4da68fccf8d422 SHA-1: 58ef459a23f186a93ae7af220a5a90a066590083 SHA-256: b8da1100bc54c2e8c1c15c22e304a2d2994b8ba3d150f5673e6c7074e730391a
126 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 ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, including one pointing to 'gimoguvi.ru/award', suggesting a phishing or scam lure. The PDF also exhibits characteristics of a link farm on disposable hosting, indicating a likely attempt to distribute malicious content or redirect users to compromised sites.

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://gimoguvi.ru/award?keyword=the+story+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407304/normal_601dc0421b11d.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/jic86hh/find_my_phone_galaxy_note_10.pdfIn PDF document text
    • http://cupe1.ru/26456734232io5ri.pdfIn PDF document text
    • http://wizimesataw.22web.org/61386340381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fcde09297355.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/sidjhtx/zadebitebagemo.pdfIn PDF document text
    • http://italysummer.fun/how_to_reset_disabled_iphone_11_without_computerxv1cl.pdfIn PDF document text
    • http://gramnews.xyz/dagiramarududuroruf0nsmi.pdfIn PDF document text
    • http://true-board1.club/adverb_clauses_exercise_with_answers4w3q8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5fd9d7a85fef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxatuvuridotit.epizy.com/kabovinibojosidu.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/43472941102.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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 5152 bytes
SHA-256: fe0559faf540fe4c26820820c5ec7d143f7828a02fe8db63e7cf1f46b66e468c
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10380 bytes
SHA-256: 94e6b07cd1675a26552a3c4e4aadc4381e8ffa13b5b2b289ea9b4ef167c205a9

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