Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7cb9271e0de0ab…

MALICIOUS

PDF

81.8 KB Created: 2021-04-03 02:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 049fa21250764da282d50152c4065171 SHA-1: ba4ce7d06e85358942d3eaa9db74ae60f6a2c1c9 SHA-256: cf7cb9271e0de0ab9857b52c61cdd9dbb1df7f486665179d86baded1c3fe769a
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external URLs designed to redirect users to various websites. The presence of multiple external links, some hosted on disposable domains and flagged by heuristics as a 'link farm', suggests an attempt to distribute traffic or potentially lead users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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+do+we+mean+by+research+instrument PDF link annotation
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/xotubupimisule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_601e37b761a37.pdfIn PDF document text
    • http://wenukitabozuv.22web.org/class_11_ch_3_chemistry_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fdf5622b6126.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/5fcab59f97b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_601d8ffe70864.pdfIn PDF document text
    • http://gazariruv.iblogger.org/beach_wedding_itinerary_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_f27908449ec546439751ca4338d157b2.pdf?index=trueIn PDF document text
    • http://gakefeli.rf.gd/epidemiologia_descriptiva_analitica_y_experimental.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_9dfc523dfd434da3861b0efadbd1c813.pdf?index=trueIn PDF document text
    • http://jinixoxugud.rf.gd/37372202361.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/fabajezafuxibugano.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/42711699024.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_ae321b5c84af4340b19b4b7fb1395d3d.pdf?index=trueIn PDF document text
    • http://bibesatu.epizy.com/android_adb_driver_xda.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/42653618522.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_eab6232d67a2489991d908c02cf4522c.pdf?index=trueIn PDF document text
    • http://tabunubefuxa.epizy.com/tobewonilat.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/panasonic_dmp-bdt220_manual.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_b3efebb6532d4d829bad14a04436c419.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/dieline_templates_boxes.pdfIn PDF document text
    • http://vipebajivakal.epizy.com/rational_and_irrational_thinking.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 5496 bytes
SHA-256: 2cdc8e407c7d4031288b0e102995778ac143f22174d7ad6cf05b08c22a2f9870
font_01_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 11228 bytes
SHA-256: a7ed1f60ef86a543f300a6736202d32bb13089eea754ded32fb41cea9a3a9e64