Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c731e98719dc7f…

MALICIOUS

PDF

81.6 KB Created: 2021-04-06 14:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6afb8141bcce6f0b22c31faa47d1e0c SHA-1: 22a8ee4ea42a676124528e9667704ef1f20501d6 SHA-256: 83c731e98719dc7ff9c7517cc671ad7eb019cf152dd376382f60757486b2caf1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of embedded external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-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=tom+sawyer+island
    • https://cdn.sqhk.co/pawosuku/AAgjChi/mewanawalatexesuja.pdf
    • https://vimikova.weebly.com/uploads/1/3/1/4/131437612/1893729.pdf
    • https://cdn.sqhk.co/xuxozowaki/XcWWMi2/nobodies_murder_cleaner_mission_5.pdf
    • https://cdn.sqhk.co/fudikuzi/jiXQhhg/emergency_sounds_hospital.pdf
    • https://cdn.sqhk.co/kupulifip/iMBgcyY/20209708400.pdf
    • https://cdn.sqhk.co/nanubebebot/iiid3NA/75334708590.pdf
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/f754ba57bfbed9.pdf
    • http://latujajugudewum.iblogger.org/braderie_lille_plan.pdf
    • https://cdn.sqhk.co/rejiwosujupa/7jfRhfE/makaforiku.pdf
    • https://cdn.sqhk.co/xunijejozi/eQgi6Yf/xodamitosanisi.pdf
    • https://cdn.sqhk.co/malevevipali/3Ofifii/wheel_of_fortune_game_online_cheats.pdf
    • https://cdn.sqhk.co/torixugajo/ifFjejd/xeroxotowekazabalaxujomu.pdf
    • https://cdn.sqhk.co/vorebilifi/icXyBic/44967543539.pdf
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/mateliwobesurubovox.pdf
    • https://cdn.sqhk.co/morovujefi/cggjdhc/fire_alarm_sound_effect_super_loud.pdf
    • https://cdn.sqhk.co/temetixufuxi/gjjTphd/spell_street_cred.pdf
    • https://cdn.sqhk.co/zupitefa/TjhhdFS/rail_maze_train_puzzle_apk_mod.pdf
    • https://cdn.sqhk.co/vuzefegevo/aLMibib/71770156048.pdf
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/xivixuwitazude_bugagi_xaruveferap.pdf
    • https://cdn.sqhk.co/jojikoxazew/wOwjhaf/free_coreldraw_x6_full_crack.pdf
    • http://rurokewe.iblogger.org/street_fighter_android_apk_data.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vuremekewema.rf.gd/61298710180.pdf
    • http://nugikefabepumuk.epizy.com/xisasexodel.pdf
    • http://wawukekaxemiju.epizy.com/77710938732.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_off00010468.bin
7a61cf0d8028cb22d10869aa7d67aead5df57a27f96cc9fa2769b390eee97b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 5116 bytes
font_01_sfnt_off000115c8.bin
760b7b52fb7a6a747c356ee045016337648311c84950a1ab21b4be6f8996734f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 10296 bytes

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