Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a68374443b3ab66…

MALICIOUS

PDF

75.9 KB Created: 2021-02-15 19:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b4481b9ce0224bb7a150b796b6a5d6c SHA-1: 2758f8eb666c252f14c23a3498383501307bb70c SHA-256: 5a68374443b3ab663f3096fb8153e7851803d9d7d1112e36a5f1e66312072c31
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+is+situational+irony PDF link annotation
    • http://autoupgrade.website/62629194563qlu65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5fffaf3ad6dc5.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/ijgcicz/battery_charger_for_car_portable.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/cxiaAWO/tank_arcade_shoot_em_up_ps4.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/9b301e.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/icjcjg9/detentionaire_season_1_episode_50.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/d9d669cc15464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5fd73a3ec0bec.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/4ggKujj/8661542502.pdfIn PDF document text
    • http://nudistoff.club/juwavejaxelosuloluxajovow2s3nh.pdfIn PDF document text
    • https://cdn.sqhk.co/suxugipajepo/a8Zgcgd/ctf_capture_the_flag_online.pdfIn PDF document text
    • http://snatural.space/raxuregelubusaxiwokoge3kzkr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_602106e7bdb08.pdfIn PDF document text
    • http://hargotel.xyz/parent_plus_loan_consolidation_calculator1sgrx.pdfIn PDF document text
    • http://kolomata.ru/527575438542ybhv.pdfIn PDF document text
    • http://freds.space/xuzogazoneboxuwuwapolut6kyy.pdfIn PDF document text
    • http://edalovert.xyz/132528143972rl0w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 4652 bytes
SHA-256: 3f0e568644a5087d5525ab3c978cb13382ec4c5240dd911667c9e8c082571606
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10340 bytes
SHA-256: 838d7462b91a371f07bea29a942e3756dec0ecc082965578d44b4c95ea1fcd11
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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