Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7867feaf9c57fc2…

MALICIOUS

PDF

83.1 KB Created: 2021-02-24 13:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ca6a6141de5a1c137fd7dedec17709c SHA-1: 60a2e69d00bb932dfffc8b1ead5d44b472a91951 SHA-256: b7867feaf9c57fc20f5537c84ba4f951b6e623c35f5929ad8ee18491030833a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The document body, though heavily obfuscated, suggests a technical topic, possibly to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=java+swing+vs+swt+vs+javafx PDF link annotation
    • https://cdn.sqhk.co/pukikojat/iaLhePQ/jiramafelubuladas.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/gyhdoRF/24086381753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5ff4da38ad2db.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/heSQs6h/85512351618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_601d2c8350e62.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/ifs9Oii/guilty_gear_strive_beta_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fcaa27c6aaa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465393/normal_5fef0cd3dcb28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fe0c418cfdbd.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/vjjjjvF/lebalevipoviko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450040/normal_60355dfd6438e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_6010b41ebba76.pdfIn PDF document text
    • http://jilet2.club/8639494432685y16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selofedibaxonal.epizy.com/airplane_games_free_for_laptop.pdfIn PDF document text
    • http://lojarine.epizy.com/mazexozola.pdfIn PDF document text
    • http://wozurowimure.epizy.com/lagu_dengan_caraku_bianca_jodie.pdfIn PDF document text
    • http://tunawumananedi.rf.gd/hampton_bay_ceiling_fan_light_not_working.pdfIn PDF document text
    • http://zuvojiveko.rf.gd/3d_max_booth_design_free.pdfIn 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_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 5092 bytes
SHA-256: 04611e7f580fb0ab476b9d38eb2728a310f5c70fc1ba008b7a61dd200e07e4a9
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 10748 bytes
SHA-256: 43e95a242c98174cdd5ea397d1e026032d35b462189151564ca09d50491a0772

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