Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c78fbff39607f9…

MALICIOUS

PDF

108.1 KB Created: 2020-12-07 23:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45b5a3c5d0a247421f6b7bf1fc60362e SHA-1: 1b68385b4504248af6754d600b882a6280346636 SHA-256: 51c78fbff39607f99b0ede2e278b3dd091706d15e5c9000f2f50d90f19ae9f21
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic firings indicate a malicious redirector link and a PDF link farm, suggesting the document's primary purpose is to direct users to potentially harmful websites. No scripts were extracted, but the structure and link analysis strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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
  • 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://gettraff.ru/strik?utm_term=arcane+trickster+5e+rpgbot
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fbcab9e096eb.pdf
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fc42e8a27637.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/1352491.pdf
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/7567319be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zumomasugipeno/99338091705.pdf
    • https://s3.amazonaws.com/wujafivabipo/juranipedizotumoxuv.pdf
    • https://static1.squarespace.com/static/5fc7b22444e997374a2e50e6/t/5fca7eee1e3eb74714843948/1607106288316/69236196485.pdf
    • https://s3.amazonaws.com/mejigavukolu/types_of_antisocial_behavior.pdf
    • https://s3.amazonaws.com/rupatojuko/87447382909.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe26e65147b14804fc78ff/1606297319565/ellsworth_ave_school_danbury_ct.pdf
    • https://s3.amazonaws.com/gewuwasi/application_of_biotechnology_in_agriculture.pdf
    • https://s3.amazonaws.com/varolexexus/59728676668.pdf
    • https://static1.squarespace.com/static/5fc78deb5c272238a81acf84/t/5fce13015d2e6f3bda63f1f7/1607340802898/2897468266.pdf
    • https://s3.amazonaws.com/fosawef/rebuild_data_mart_management_reporter_ax_2012.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_off00016c1d.bin
8216156f2952e84addc14e24513f7ac4c1bc16d10bf4c020db9affe5850fa484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1D 5384 bytes
font_01_sfnt_off00017e81.bin
0ad94b7c340877b85b3b40057d1b0ed1754e0d71947520763d2241d10f2de330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E81 10688 bytes

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