Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb664ad9779ca4d5…

MALICIOUS

PDF

98.1 KB Created: 2021-05-05 07:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c12c2d33be3442536650ca8ebcb7fcad SHA-1: adc8f4daaabe11d570077b04634349a311d77c90 SHA-256: bb664ad9779ca4d56f9efb4b3bc80ae9949d70198f2abbe9f73d3b4d24434db3
156 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a 'link farm', with the primary malicious URL being https://ponafet.ru/strik. This heuristic, combined with a high ML classifier score and ClamAV detection, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the presence of embedded URLs indicates the document's intent is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=habibi+craig+thompson
    • https://cdn-cms.f-static.net/uploads/4387242/normal_603eb5131b437.pdf
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5fc8d0682456b.pdf
    • http://sogixusi.medianewsonline.com/43353017450.pdf
    • https://cdn-cms.f-static.net/uploads/4448980/normal_6048634c1be95.pdf
    • http://xijulefabogi.getenjoyment.net/does_the_bowflex_max_trainer_m3_really_work.pdf
    • http://pawomodom.medianewsonline.com/gate_ee_2020_rank_vs_marks.pdf
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5ffe70094a298.pdf
    • https://cdn-cms.f-static.net/uploads/4455914/normal_60331b9103f05.pdf
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fd80b6eb58bb.pdf
    • http://nokiwurugibub.mypressonline.com/beneficial_owner_form.pdf
    • https://cdn-cms.f-static.net/uploads/4452161/normal_605f45eb247f0.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_601a05b91cd67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_e161f169d3a448388217ca12aa58ab36.pdf?index=true
    • http://pedirite.onlinewebshop.net/dikukufuvoxemagub.pdf
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_73738f46b9574e44bdf061b14d802a41.pdf?index=true
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_413b958645d64237825d52b7e661e872.pdf?index=true
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_6895d1ac8adf493fa2888851d367f819.pdf?index=true
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_ad025ceb5f8d449eab36f6f61463f597.pdf?index=true
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_402a05b6fa9c41d6a20ff396c99c743c.pdf?index=true
    • http://mefinuxewo.epizy.com/census_2019_report.pdf
    • http://toxosimokumo.rf.gd/55950347620.pdf
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_6f840a533c214415b6e47321f132070f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001357f.bin
535c450a155fc480b13de6f111bc5c35ad49d302bc3618cf8287d400f0e58693
pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 5088 bytes
font_01_sfnt_off0001468d.bin
75b12f825c6c06895fb764315af1525aefa824c90716934f9dd7f6bbe591c33f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 11344 bytes
font_02_sfnt_off00016d1b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1B 4324 bytes