Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31238805bd60502…

MALICIOUS

PDF

80.7 KB Created: 2021-02-20 03:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d305306b686f0cbe9e01d8f1ee618fb0 SHA-1: e9858f1371c80defe05b4c0417dc2affb6bab7e3 SHA-256: b31238805bd605022cc714527a6b1a80e623a881dd2bd7231b3aadedaced7899
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. ClamAV detection and ML classification strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=how+to+overcome+ocd+naturally PDF link annotation
    • https://cdn.sqhk.co/burajugi/okjjNjj/movaziluz.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/uEhbjh8/73968347410.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jH3TPhd/zivabekuzanodojibojosuxuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ffcba9467f35.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/aji5Iol/lelugajamem.pdfIn PDF document text
    • http://ingmijn.com/vagamikifojololamarivuerib7.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/8hhihje/45390111401.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/N7gfhdz/lolitajonumorim.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/NhdpigA/23272540380.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/fEhbX6Q/samsung_frame_tv_art_gallery_subscription.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_600c434b5626a.pdfIn PDF document text
    • http://busurman.space/40543945666lpxbc.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/jcggjgc/69966079823.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/bMgijjz/master_s_degree_in_education_technology.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/5A4UheB/2048_hacked_mode.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/446291609619dsle.pdfIn PDF document text
    • http://hookup154.site/53717698284ai22f.pdfIn PDF document text
    • http://changepass.online/91659150048vfsii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_600be5e6a0c22.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/f0qjggi/talking_tom_gold_run_android_gameplay_download.pdfIn PDF document text
    • http://antileqphh.site/jetesomezisupezinuan47d.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_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 5120 bytes
SHA-256: a2bd7421fc42df9ab5045d0241704394dadcf780029b0206a1146ce9edb22836
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10592 bytes
SHA-256: dba48af7dda651969f2b38e52e3f8dd9bcd8c6f9c78d6a46f30b11bec38e35c7

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