Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a333166dcaf2ae…

MALICIOUS

PDF

87.0 KB Created: 2021-03-15 20:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d4e810b32d9e1795a330ecc4b2c196 SHA-1: d36458901f4121ac5c099d3c50427df0591c9d15 SHA-256: 21a333166dcaf2ae07bcd8947c8aa68d8a58e48688722efd77fa137d56e1a2ba
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links pointing to other PDFs, likely for SEO poisoning or to host further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=overtime+pay+worksheet+pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/0bf3d5a49fa.pdf
    • https://cdn.sqhk.co/pefapalotux/igZihjb/budolaxazugulujad.pdf
    • https://cdn.sqhk.co/rolekixawute/zvIifuF/41473876060.pdf
    • https://cdn-cms.f-static.net/uploads/4428045/normal_604182ef7dad8.pdf
    • https://cdn.sqhk.co/tewokozogop/wgjhhgg/58947458756.pdf
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fcd5f4e9d11c.pdf
    • https://cdn-cms.f-static.net/uploads/4463306/normal_6041920e3a802.pdf
    • https://cdn-cms.f-static.net/uploads/4448984/normal_600e0013d2772.pdf
    • https://cdn-cms.f-static.net/uploads/4458388/normal_604b19b398730.pdf
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/rotulexefe.pdf
    • https://cdn-cms.f-static.net/uploads/4444875/normal_602add120770c.pdf
    • https://cdn-cms.f-static.net/uploads/4380854/normal_6030488cc34b6.pdf
    • https://cdn.sqhk.co/disonixures/2Nl7jtJ/dituzazevitimebimot.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_6046292e8d280.pdf
    • https://cdn.sqhk.co/rubutemoxe/mNTGoUL/bseh_aarohi_school_answer_key_2019.pdf
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/c6ed6b39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_9291c7ddc472469c8d495cbcfabbfe21.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5cf02fe-de84-44de-b2a0-ed026483f3b2/bijesinofabusolu.pdf
    • https://uploads.strikinglycdn.com/files/63130223-4a0e-425f-bdff-6ba26d641c98/craftsman_5hp_20_gallon_air_compressor.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_0e01fb3b822743669400811e9cf38802.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_36d62993f5454d4197697efa4831fbbd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/56503c66-6e78-4cf4-9a22-e494398c8c93/20029256811.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_ecd6a49f9ea844298a0c58874303126d.pdf?index=true
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_d2c77a6aac094a05b59c1e6b49d760f4.pdf?index=true
    • 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_off0001158d.bin
907cf1aa92760448ac7badf21ea5d39f95028578303d21ac7e1bbc3ff5a035eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 5596 bytes
font_01_sfnt_off0001287e.bin
349dfe9586618daa4cbe16a749d0f29cde2a7502ad94123b2d950d4acbedc3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 11200 bytes

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