Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7afbf517351f471…

MALICIOUS

PDF

72.9 KB Created: 2021-04-03 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb60f84c93d83edfed4293fd4c6c2df SHA-1: 7904c86011d80cba17f94bd82e3fa77e1e909ccb SHA-256: b7afbf517351f4719ab6447ee757889d940eb1d95368601748d86d276d7692e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'statistical mechanics'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+is+the+theory+of+statistical+mechanics
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fe17245cb98e.pdf
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5ff63a9e960be.pdf
    • https://sesemuxedewa.weebly.com/uploads/1/3/4/0/134017121/nijopa.pdf
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/1341932.pdf
    • https://cdn-cms.f-static.net/uploads/4456376/normal_603bddbb8eb78.pdf
    • https://cdn-cms.f-static.net/uploads/4379240/normal_604aa4780d6d6.pdf
    • https://cdn-cms.f-static.net/uploads/4457572/normal_605898177f05b.pdf
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/taxokirukawafanes.pdf
    • https://static.s123-cdn-static.com/uploads/4472488/normal_60088477baab8.pdf
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/jovimasa-wukigifotemowa.pdf
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/poxiwuzuza.pdf
    • https://cdn-cms.f-static.net/uploads/4404502/normal_600d9f9e4aa27.pdf
    • https://xazebalewez.weebly.com/uploads/1/3/4/7/134766000/5e34ea8.pdf
    • https://cdn-cms.f-static.net/uploads/4386084/normal_603e65a3adda4.pdf
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/913352f1b607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejakixoweka/88655890965.pdf
    • https://s3.amazonaws.com/gafedupeba/car_racing_games_free_no.pdf
    • https://s3.amazonaws.com/welanisowari/vs_code_format_json_file.pdf
    • https://s3.amazonaws.com/pekatikisuruki/89775448922.pdf
    • https://s3.amazonaws.com/baritexovopa/90327290136.pdf
    • https://s3.amazonaws.com/loxopudizus/93622273498.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee4.bin
82e9aa809ad3c0f445efab79bc8b787a5c643ea2318b509fd9830b7a248d9707		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5236 bytes
font_01_sfnt_off0000f0a0.bin
bfeff972e0b4ef0dd5e5fd7107930de5ea640459ccb995c426ac49bc616fdfb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 11000 bytes

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