Malicious PDF — malware analysis report

Static analysis result for SHA-256 9239c54f903a92c1…

MALICIOUS

PDF

80.5 KB Created: 2021-02-26 19:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 78604b0530fac103f01db8cd704b92c6 SHA-1: cd419df0713edb9c7f485d2b50ed0f000a159add SHA-256: 9239c54f903a92c10525f1b0d821e768f9a43a41f6b816b5bebe3d842e5128bc
204 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=nordictrack+c700+treadmill`. The document body, though heavily obfuscated, appears to contain metadata related to a treadmill, suggesting a lure to trick users into clicking the malicious link. The presence of multiple disposable domains and link farms further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=nordictrack+c700+treadmill In PDF document text
    • http://sevezor.scienceontheweb.net/41735233977.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/rurakinanojelotov.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/Silgjgj/bass_pro_shops_springfield_mo_jobs.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/29092698379raltb.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/3365691711.pdfIn PDF document text
    • http://blockhcain.host/agthx_ytd_performancermmpv.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/jezivalevuxafa-xorevekireta.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/bissell_powerforce_compact_turbo_2690_belt.pdfIn PDF document text
    • http://sun-italy.space/free_loan_calculator_for_mobile_phonejcv0a.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/9201386.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/Dhfk5he/kupijejuwekefusufonakuni.pdfIn PDF document text
    • http://aov.one/luthers_95_theses_with_explanationsqg3k6.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/mass_effect_2_crack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/formal_dresses_australia_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/73641906900.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/votibubapudodoxonu.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/jump_force_next_dlc_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/bluestone_alley_piano_sheet_music.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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 5160 bytes
SHA-256: 0452e09e1c561d4caa1b0af3b0f0417d7b9c346122867f1799588d9604174b0e
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 11488 bytes
SHA-256: 8c5dfdc2dd19cc6f93e059ce1fea3f4a6d95531966faa50e879521b4824008f7

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