Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd14c684aeeb466…

MALICIOUS

PDF

88.9 KB Created: 2021-03-20 19:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e35cfb1ad85f6ca84385514e34a2fa8d SHA-1: dd45d8da695f190de9f93cdf2bfea4b66b2a89df SHA-256: 1fd14c684aeeb46647bc650a040b236c96498d0e7c907d9985790b856a1ec8e2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing/trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The document body, though heavily obfuscated, suggests a lure related to downloading a book, which is a common phishing tactic. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ponafet.ru/award?keyword=bangla+adarshalipi+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fcb5b453b1bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5ff2ae2bf367c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_600aa69b2880c.pdfIn PDF document text
    • http://on-arenas.com/strategic_marketing_management_alexad28db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_60540469e83d4.pdfIn PDF document text
    • http://wofoweniwer.iblogger.org/baaghi_film_video_song_bestwap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff4980c30e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_601bf9e647a93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5fec3a6c807bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_6040af8e1ac59.pdfIn PDF document text
    • http://rentline.pro/770704246059e5mb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6044f9f022ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_6023f9c2f0fe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5fe26d965cb14.pdfIn PDF document text
    • http://minuzozudutaji.iblogger.org/rubepipexufat.pdfIn PDF document text
    • http://pressit.fun/69371128605monvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_5fda8008495aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_601a3210ea90e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajeripevexe.rf.gd/7855643675.pdfIn PDF document text
    • http://vekamujibatebig.rf.gd/86927258927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf34196-a0aa-4a3f-8cab-807612c5797d/furepaxadefeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd43cb9b-0491-4826-bb16-4e5bedc1ae37/19790178557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4124a9-dbc4-4140-8c1e-4d7eae2d5702/how_much_do_starbucks_baristas_get_paid_in_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dbf16c-f46e-4b44-b590-105ed53bf40b/how_to_set_up_rain_bird_wifi.pdfIn PDF document text
    • http://memaxomumeto.epizy.com/bartolinitis_aguda_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b8b8a1-7b2b-4e80-b505-41aed7f9a07a/23975166485.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 5648 bytes
SHA-256: c33e23424f02bf6f2931233bfeb9e3eecfbfbdf48801c0867463e72c2e572e3a
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 14388 bytes
SHA-256: 2eff71e61b0fd115fb2228f2cc226f621e9a35a96c2166f6be15f523c16045d3
font_02_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 10748 bytes
SHA-256: d32c7d81b6a769850b51dd88a424dc5e2fd9b8c033f82b368392170f3eeec9db