Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c739cc315f1f7ed…

MALICIOUS

PDF

72.0 KB Created: 2021-01-09 23:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b883cd906de7e60b937a0fc81df3f489 SHA-1: 7de8108d90cc05775f9399395d17b6b1d04029b9 SHA-256: 8c739cc315f1f7ed646af18c9c5a52bce87544753ac843b628268112a55c188e
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'SE_FAKE_CAPTCHA' heuristic indicates the document displays a fake verification prompt to deceive users. ClamAV also detected this file as a phishing trojan, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://traffking.ru/aws?utm_term=cascading+style+sheets+benefits
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/rupivamow-begafipo-kenemi-rarexopuruveza.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/rujawagot_vefoloxe_wuxapinofi.pdf
    • https://cdn.sqhk.co/vaminika/bkSMihW/pinball_arcade_addams_family_pc.pdf
    • https://site-1166676.mozfiles.com/files/1166676/frogger_ps1_cheats.pdf
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/tokep.pdf
    • https://site-1172012.mozfiles.com/files/1172012/dinosaurs_world_near_me.pdf
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/kupariwuguropizi.pdf
    • https://mowejeli.weebly.com/uploads/1/3/4/6/134672800/a98d4eabf70.pdf
    • https://site-1171749.mozfiles.com/files/1171749/islam_ka_hero_number_1.pdf
    • https://site-1178750.mozfiles.com/files/1178750/my_singing_monsters_dawn_of_fire_breeding_guide.pdf
    • https://cdn.sqhk.co/kewudomavave/iaFTiiv/xavodulisalupevatu.pdf
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/varasowuwakux-gafimimulirexi-jekefugusukan.pdf
    • https://site-1195473.mozfiles.com/files/1195473/reposteria_dominicana_cerca_de_mi.pdf
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/be21c4ac0.pdf
    • https://bikubelefa.weebly.com/uploads/1/3/1/6/131606475/33c96d8b718c9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000de88.bin
6b5e30986883b7a466f3466c66b01f5a2d26f83c051d75c6b45bc310307ea77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 5332 bytes
font_01_sfnt_off0000f0a9.bin
5f30abe1e059f0293185231c407e2a098b211d8da8722bfeb3b678ff6647c435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10056 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.