Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e79d36b74808a65…

MALICIOUS

PDF

83.6 KB Created: 2021-06-10 20:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3e2b90d7d25ed596807e3b2cd3e8b75 SHA-1: 8101c33ba156615d4974cb5d4ca669b4260cdbb9 SHA-256: 0e79d36b74808a65a5567c4e8da018e9c093e05f90e3a3f5a3e94c5a2a071a94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute traffic. The presence of a 'utm_term' parameter suggests a tracking or phishing campaign. ClamAV and ML classifiers confirm the malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://synerhu.ru/pbw?utm_term=minecraft+shaders+1.8+9+download
    • https://cdn-cms.f-static.net/uploads/4410207/normal_604ca8ae8459d.pdf
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5ffa15ca1b039.pdf
    • https://lidoporovumo.weebly.com/uploads/1/3/4/5/134506542/4019904.pdf
    • https://jobipidamefoji.weebly.com/uploads/1/3/4/6/134696246/lumazasuxi-magodo.pdf
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/sakotidab.pdf
    • https://wejorawifaloju.weebly.com/uploads/1/3/4/4/134458418/3800916.pdf
    • https://cdn-cms.f-static.net/uploads/4501975/normal_60bff75762dc9.pdf
    • https://wezefumuge.weebly.com/uploads/1/3/4/6/134614004/fumoralesineku_mavimara.pdf
    • https://fitikelamo.weebly.com/uploads/1/3/4/6/134668278/kogulinovojolof.pdf
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/f4a2675f48b2d.pdf
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/logeribinozar.pdf
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/xoxatekidedu-pavexapajuvi.pdf
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/2f242eaf74.pdf
    • https://bazawafamojuw.weebly.com/uploads/1/3/4/5/134508147/adeb3253e6d.pdf
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fed9af3a4698.pdf
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/terawiz-pevebovep-tilufikuluvebex-dewibexun.pdf
    • https://walanugenaxoduf.weebly.com/uploads/1/3/5/9/135964425/jufekoxaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71c0b28c-a4a4-42a1-a8d3-81f0a011a29a/58006162369.pdf
    • http://pebolokunaz.pbworks.com/f/masubifufoxaganexejawo.pdf
    • https://uploads.strikinglycdn.com/files/71adbd65-f6fd-4ee0-8b55-5f3d1b96db7a/dijuzoxewovowujubawo.pdf
    • https://uploads.strikinglycdn.com/files/70dacd39-753a-4f30-be51-e237add9e839/83086071502.pdf
    • http://tavaretaz.pbworks.com/f/loroziforolerowu.pdf
    • https://uploads.strikinglycdn.com/files/5c43d128-1bb6-4e94-baf8-85d261999230/fuxidiruxigaturixiw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b1.bin
e6b500c6d43ff3ffab31ac400729007ccf2ef083ca30107f700d7cda701dfed2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 5640 bytes
font_01_sfnt_off000103fd.bin
69403f2387e4203f59bc8624d9c19348d8e0baad2ee0e48c71acfc0f83efc18f
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 11340 bytes
font_02_sfnt_off00012a32.bin
8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 16064 bytes