Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08c13012899e0a0…

MALICIOUS

PDF

69.5 KB Created: 2021-03-11 19:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9fef04f645f5ef14922f66d59d8066f4 SHA-1: a1c0cc217e67e126342cce1829daea7cdf8c6b62 SHA-256: f08c13012899e0a0dceadaa0821f230ffd27495aead6edfd2570acf637c55f2a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to "why foxit reader crashes", likely a lure to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=why+foxit+reader+crashes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5feb95454507e.pdfIn PDF document text
    • http://maturibcgj.space/gatorezodufaxz85nk.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/jisorebi-jokuwi-jufidagofolavur-dametux.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/3755472.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/hhhhegc/movie_star_grozio_salonas.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/vjfOWgf/73227364307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc4d9c3a8bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_600fe4e9bdb9e.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/sudoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5ff47e29d38a1.pdfIn PDF document text
    • https://lemidedimiba.weebly.com/uploads/1/3/0/8/130874299/pujizajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_603a772185d2c.pdfIn PDF document text
    • http://afracheat8.xyz/tiwofov5kd6s.pdfIn PDF document text
    • http://spain50off.info/which_braun_series_9_is_the_best7pzhg.pdfIn PDF document text
    • https://luwomobesu.weebly.com/uploads/1/3/4/2/134235002/2b045997c75.pdfIn PDF document text
    • http://idslim-italia.site/8014787712027s1o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445570/normal_60045b3eadc68.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/xamabiwatikor_bonuja_tinix_wevujitofirowex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_60435919476ad.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/semofitazofo_dotixe_xadufitar_wevujiribazukib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_6041a05f35c87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 5260 bytes
SHA-256: cc33010ed253b7abda4ad47ba4c483d1aae9f6ac6570c021fc80d5c055ff71ae
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10648 bytes
SHA-256: b404ddc5ed2aec3278b1f47cb13847edb44f1a75684009f7d24857552d85dc87