Malicious PDF — malware analysis report

Static analysis result for SHA-256 14914f8d61d050f3…

MALICIOUS

PDF

76.9 KB Created: 2021-04-15 22:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b627007f2ae0fa782f83b2fc2969bd4 SHA-1: de4fc80186adf253aad7c8bfc1fafd5c2901376c SHA-256: 14914f8d61d050f355c96f5eb297f380049ece9de65281a79ccb4e694cb083a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://crophysi.ru/strik?utm_term=should+you+wear+lifters+for+deadlifts', is likely part of the lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=should+you+wear+lifters+for+deadlifts
    • https://cdn.sqhk.co/raxoxawupej/jZrgjan/xulotisifaxedo.pdf
    • https://cdn.sqhk.co/sewuvavimebi/j5f2fcQ/27764125361.pdf
    • http://shoop-fm.ru/23573436709zk8y.pdf
    • https://cdn.sqhk.co/rizitewav/jhhhigi/play_stick_war_2_order_empire_hacked.pdf
    • http://help-bluebadgecenter.com/gipilidaduruwugekupusouf4er.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zemigiduwagafu/52142782418.pdf
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_7673b0fbcebc487a9ae5d405e2602a91.pdf?index=true
    • https://s3.amazonaws.com/tizowodifi/xukatoge.pdf
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_8cccc7c3fea541eeb5c6565cadfe7dae.pdf?index=true
    • https://s3.amazonaws.com/limepusotanal/honeywell_humidifier_hcm_350_manual.pdf
    • https://s3.amazonaws.com/vavabi/arduino_projects_tutorial.pdf
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_9c694590bd1c465ba5126aec436ab4ae.pdf?index=true
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_cc8e29846685438bb26d14d8adbde11b.pdf?index=true
    • https://s3.amazonaws.com/gebukil/alfa_laval_ab_annual_report_2015.pdf
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_371dbd25f9ce435b83cc8bea6b1d0966.pdf?index=true
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_8f7b7981d6d5482cafdd41f0a336e34f.pdf?index=true
    • https://s3.amazonaws.com/fidefofudi/formal_letter_requesting_for_documents.pdf
    • https://s3.amazonaws.com/bogijexu/surfin_usa_flute_sheet_music.pdf
    • 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_off0000edbb.bin
df8fd6c5e2301a81b4b67297514a7bb5ab5b26b1dca6b2f25b33618aea9b1780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5292 bytes
font_01_sfnt_off0000ffc7.bin
a40ac161edc380992a73d90c017fa88818fce261d151230c56fe3cf03fe414f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 11484 bytes

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