Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a15736a6369a5c…

MALICIOUS

PDF

74.2 KB Created: 2021-04-06 11:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54d03c7a77f1447e15adc7fa76061968 SHA-1: dff8df5e43a6790078b01fea359531dcb46e646b SHA-256: f8a15736a6369a5c1da8dfeb2dd75d9151c72800b3355090a1aabb2674268f8e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely for phishing or redirecting to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=what+is+moolah+shrine
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/jugidavigadifolidil.pdf
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/fuwupapi.pdf
    • https://cdn.sqhk.co/jerivudofin/djay359/74159329793.pdf
    • http://fijeveg.iblogger.org/poratibuvuzuvisojekovilov.pdf
    • https://cdn-cms.f-static.net/uploads/4393034/normal_604a9f5a417dc.pdf
    • https://zomonuluxerow.weebly.com/uploads/1/3/4/8/134867862/8403824.pdf
    • https://static.s123-cdn-static.com/uploads/4451756/normal_600557cfd2bdc.pdf
    • https://cdn.sqhk.co/gukugifixija/gfaibjc/6900841614.pdf
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/2f0e938e07e.pdf
    • https://cdn.sqhk.co/viwukepato/ejPhggm/robironizijateb.pdf
    • https://cdn-cms.f-static.net/uploads/4403689/normal_605d89b9c2b61.pdf
    • http://wovegibexakebof.iblogger.org/zunitubilodikos.pdf
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5fddb132b40db.pdf
    • https://cdn.sqhk.co/gujuvizaja/jjwzSVt/61813510185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://josuxak.atwebpages.com/christian_baby_girl_names_with_meanings.pdf
    • http://tesedep.rf.gd/65794770852.pdf
    • http://mezasijov.epizy.com/importance_of_systematics_in_biology.pdf
    • http://nofadokar.rf.gd/66565184997.pdf
    • http://zezofakarol.myartsonline.com/55915048508.pdf
    • http://nuxamadoxo.epizy.com/battery_grass_cutter_project_report.pdf
    • http://wajodojizofe.epizy.com/film_avatar_2008.pdf
    • http://wapinogure.epizy.com/4992427242.pdf
    • http://fidetilodekaser.epizy.com/legend_of_zelda_ocarina_of_time_walkthrough_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d3.bin
f2a2abe905c1b3803a8b7e20aadb9e268ba8f9c3444133c94ccd71c557808723
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 4728 bytes
font_01_sfnt_off0000e5b4.bin
4d4bef6f2d5b4c8198236c94a98ce401b60287aa69eaf81e8304fe5867d06591
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 11072 bytes
font_02_sfnt_off00010bc2.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 4324 bytes