Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25dcf3c53ce15df…

MALICIOUS

PDF

103.0 KB Created: 2021-04-29 10:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64e4c1f254bf413bfc59ed71dc409e23 SHA-1: 758a4263ca72fc6657848ebd53ebaa7342be1988 SHA-256: e25dcf3c53ce15df9275235028719094a303856e6fdbf332273070d8aa0d0c4a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, pointing towards a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=instructional+media+and+methods+in+nursing+education+ppt
    • http://50offshop.pro/how_much_does_acorn_stairlifts_costevphl.pdf
    • https://cdn.sqhk.co/desixurate/fhdmgfe/fubanekulurefuvif.pdf
    • https://cdn.sqhk.co/temisexezoda/hhE3The/bell_bird_costa_rica.pdf
    • https://cdn.sqhk.co/duvapegoleva/DSLjjia/new_fall_guys_ultimate_knockout_walkthrough_guide_xbox.pdf
    • https://cdn.sqhk.co/kaxopejitin/dZhcvja/fitbit_charge_2_charger_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4453551/normal_6028b5c85b4a7.pdf
    • http://omynutural.space/3903114992806v2k.pdf
    • http://bottlechainworld.com/946183317642540t.pdf
    • http://keep-travel.com/samsung_vrt_plus_washing_machine_ur_code62mcl.pdf
    • http://pushbiz.fun/1266555580279sg2.pdf
    • https://cdn.sqhk.co/bigulikexupa/ggi5jdJ/two_player_games_on_xbox_game_pass.pdf
    • https://cdn-cms.f-static.net/uploads/4366344/normal_604edbd8ae2c9.pdf
    • https://cdn.sqhk.co/xopuxuvop/ZPifhj1/cut_the_paper_relaxing_games_on_steam.pdf
    • https://cdn-cms.f-static.net/uploads/4391915/normal_6060b341975db.pdf
    • https://cdn-cms.f-static.net/uploads/4453105/normal_604d96def132e.pdf
    • https://cdn.sqhk.co/tiviluluje/ighjbhf/31963293083.pdf
    • https://cdn-cms.f-static.net/uploads/4420441/normal_600a79a7003a5.pdf
    • https://cdn.sqhk.co/bozadukopufu/TZFrAAI/pizza_maker_apk_pc.pdf
    • https://cdn.sqhk.co/fuvazuginu/jagiwQd/64997327650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_037e6147cf324382af9158d833b14895.pdf?index=true
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_64d5442668dd491dabe77b8415e95a70.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_94dcb39cae5840cf9136100593ee8f73.pdf?index=true
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_e1f1d5cc88254944a855d0ab6e11236b.pdf?index=true
    • 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_off00015591.bin
8a81327bdc3704a5e0e50206cda14d737e96e90d89521990590b9cceaafc1d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15591 5424 bytes
font_01_sfnt_off000167d3.bin
f5df4cab03d00d34421197f0b3ef1d857e2387dde8015ab0acf10295f45f32b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167D3 11056 bytes

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