Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea2b9cfb93fa2c3…

MALICIOUS

PDF

89.1 KB Created: 2021-05-22 23:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43276d60041e1a71494b5fe9f5ab47c3 SHA-1: d35ba70f14af09573873322e498df1de19281dbf SHA-256: fea2b9cfb93fa2c3801e5463197636f6608e2a3d37e4c8fd3105f7ae170e5e58
96 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, with a high risk score. It contains an embedded URI pointing to 'https://dafemum.ru/strik?utm_term=jeff+seid+calories', which is a strong indicator of malicious intent, likely for phishing or downloading further payloads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is the primary driver for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=jeff+seid+calories
    • https://cdn-cms.f-static.net/uploads/4446646/normal_606777fee13b4.pdf
    • https://cdn-cms.f-static.net/uploads/4452861/normal_6031e230efa81.pdf
    • https://static.s123-cdn-static.com/uploads/4415321/normal_6000e4fdde26b.pdf
    • https://cdn-cms.f-static.net/uploads/4413370/normal_6025bb570dd29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/visagogijulep/chopin_prelude_1_analysis.pdf
    • https://s3.amazonaws.com/vutame/vekomajiki.pdf
    • https://s3.amazonaws.com/fomaralunex/what_is_a_fundamental_goal_of_positive_psychology.pdf
    • https://s3.amazonaws.com/susonanezaj/kixigoxamiwafukivuluw.pdf
    • https://uploads.strikinglycdn.com/files/49a68c85-a699-405e-a710-2d37000ffee6/rerumigovagod.pdf
    • https://s3.amazonaws.com/verirejon/lazuviveg.pdf
    • https://s3.amazonaws.com/vavale/18660451836.pdf
    • https://uploads.strikinglycdn.com/files/1075d851-7221-4440-ac98-c0835a99fbad/96243745704.pdf
    • https://s3.amazonaws.com/magapeguwabe/rofinoma.pdf
    • https://uploads.strikinglycdn.com/files/28d76cd7-0e9e-4478-bb33-efb67ecd8337/30432175777.pdf
    • https://s3.amazonaws.com/lukepepe/dell_optiplex_755_sound_drivers_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/baa8f151-1976-4341-b182-0cefeb1568c7/fawofesimabeb.pdf
    • https://uploads.strikinglycdn.com/files/2b05b246-0225-43ee-869d-615019c44512/robertshaw_9600_thermostat_manual.pdf
    • https://uploads.strikinglycdn.com/files/1e2415b6-170f-43ec-a833-72ca878b5b32/crockpot_cook_frozen_chicken_drumsticks.pdf
    • https://uploads.strikinglycdn.com/files/b54e3112-25f5-4f05-bd83-a0e891e01d9b/braun_thermoscan_7_ear_thermometer_for_adults.pdf
    • https://uploads.strikinglycdn.com/files/90bee898-b9e4-4e1b-86a2-4f9dd0466e87/cricut_expression_2_do_you_need_cartridges.pdf
    • https://uploads.strikinglycdn.com/files/54a2b1aa-02b0-4bfa-8c47-c4dacb11a871/58446856187.pdf
    • https://s3.amazonaws.com/xupovobejanam/what_is_the_covid_situation_in_portugal.pdf
    • https://uploads.strikinglycdn.com/files/8c9e6b21-a3da-44be-a6b8-024f467bd58a/how_long_does_a_sex_offender_stay_on_the_register.pdf
    • https://uploads.strikinglycdn.com/files/797c2fae-4535-4c65-98da-672ff03c10f8/nagedaramoliwur.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001129c.bin
1da5796b9a74cc5dc15686f338c594e8e27559c1a6938c726530eaeda064044c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 5004 bytes
font_01_sfnt_off000123ad.bin
cbed0f9d7b81df176b079d75331427b9a6953bda0b903a6cd5f782ea22a3b2bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 22652 bytes