Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4528e7954fa279…

MALICIOUS

PDF

82.2 KB Created: 2021-02-15 11:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6506f7bc5708b2dfb1bd155eef571035 SHA-1: 4c4e1d43e3cc9ea6b5d1fd3820d14e7b0f3322d5 SHA-256: ab4528e7954fa2792bd069039fb46ff39e3917db8612a8055e77ce81003c6867
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating a redirect to known malicious infrastructure at 'https://crophysi.ru/strik?utm_term=what+is+the+epiphany+house+blessing'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=what+is+the+epiphany+house+blessing In PDF document text
    • http://ru-payment.casa/83066435261avez8.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/bYrE37A/lovecraft_s_untold_stories_indie_adventure_literature.pdfIn PDF document text
    • http://repair-monokoles.ru/83366190939ylxdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5fd79710848de.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/dqiebjg/sizonos.pdfIn PDF document text
    • http://laura-egorova.ru/tumojevubalalomcwlfm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_60299ea6288b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_6008f0e625835.pdfIn PDF document text
    • http://maska-respirator.shop/professional_nails_done_at_home_near_me3j94q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fcabdda1ce11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5fceb9d791065.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/zunaduxa/2016_chevy_tahoe_ltz_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/bijiji.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/video_player_app_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/beautiful_disaster_series_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 5240 bytes
SHA-256: b8003e4c9a4f33e04e8f00780517ed0ad35beb626f8b6764380c5df684d77c9a
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 10824 bytes
SHA-256: 38b8d0fafe3fa13a5b4995dd54e845f327e5ef799a8f9fc5d6f6c1ff6a8e17c7
font_02_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b

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