Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffff2d62d25e76c…

MALICIOUS

PDF

169.2 KB Created: 2021-03-11 22:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 923a901643e84867ff8533a096aa55d3 SHA-1: 9bc766b9842e053f5fdbce751c3f2c6c78a2b238 SHA-256: 8ffff2d62d25e76cc45722e4b79fbe93b6cd4acbb55f0eebc64f0263e5a080fb
116 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. The embedded URL, while not directly leading to a malicious payload in this analysis, is associated with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=sap+co+implementation+guide+pdf
    • https://cdn.sqhk.co/zubavagi/ijalDVl/gameboy_advance_sp_release_date.pdf
    • https://cdn-cms.f-static.net/uploads/4451039/normal_60353ebe019d7.pdf
    • https://static.s123-cdn-static.com/uploads/4449177/normal_6006e487df5ab.pdf
    • http://lozejebivo.scienceontheweb.net/witaw.pdf
    • https://cdn.sqhk.co/tajixixejafi/Xggt7ie/42795149615.pdf
    • https://static.s123-cdn-static.com/uploads/4460232/normal_5fde9d3732093.pdf
    • http://fejukoturig.medianewsonline.com/how_to_adjust_a_carburetor_on_a_2_stroke_engine.pdf
    • https://cdn.sqhk.co/mixekuwuvo/wUhajem/jaredulasinusifujifu.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0cea09a6-afda-4431-b992-392fb11188ba/where_did_the_navajo_code_talkers_come_from.pdf
    • https://s3.amazonaws.com/buwosevax/where_to_get_free_neutering.pdf
    • https://s3.amazonaws.com/xuzakob/zibilovam.pdf
    • https://s3.amazonaws.com/gewisetug/ccs_university_exam_form_last_date_2019.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_d94a325a1a6f4563b25df11b5cdc59ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cbf2e405-ac41-4cc7-88fe-ff02540f0e13/89008918643.pdf
    • https://s3.amazonaws.com/kulinisokakewi/64109851276.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_59a4e1c8fa094f179b44fe78b57a85de.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_7bf0c3a6fb1a42c18c03f6b59ec63ad1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d316d61-f191-4531-8623-594f73587c7d/51204335117.pdf
    • https://uploads.strikinglycdn.com/files/73e91e00-0015-4598-afb7-9bc584df3155/zefosaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002552d.bin
4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2552D 1684 bytes
font_01_sfnt_off00025d91.bin
7d985fec18e4f867fd755287992739ccc00241ef661926498769f6b1aab5bd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25D91 5304 bytes
font_02_sfnt_off00026f91.bin
c4d2b457992155ceef6349f824dadc49cdae217e18a3e51f55e2939f81c4dea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26F91 11540 bytes

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