Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cf21124e1cb6cc…

MALICIOUS

PDF

66.3 KB Created: 2020-11-20 10:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1bf7e66e30499283ed5a1c1ec0c19e5 SHA-1: d5b255d75b0edff4797897ed8c4c38f859c2ee7a SHA-256: 75cf21124e1cb6ccc81785d055063aa6ce7a9caaa470213d29d28e30d2fa8e70
214 Risk Score

Malware Insights

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

The PDF contains a malicious link disguised as a 'Next of kin affidavit format', which is a common lure for phishing attacks. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the link leads to known malicious infrastructure. Additionally, the PDF contains a large number of external links, suggesting it's part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=next+of+kin+affidavit+format
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5fa7730be6bff.pdf
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/77c79d5bf.pdf
    • https://fapezadedafax.weebly.com/uploads/1/3/4/6/134609176/terupokilo.pdf
    • https://nusokusin.weebly.com/uploads/1/3/4/3/134350978/3134004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jazuravazaguz/jojeku.pdf
    • https://s3.amazonaws.com/kozibowisenatu/laxalajujogerom.pdf
    • https://s3.amazonaws.com/memul/70128281198.pdf
    • https://s3.amazonaws.com/tizowodifi/carquest_battery_charger_cq-80cr.pdf
    • https://s3.amazonaws.com/zetare/kasawunotunuz.pdf
    • https://uploads.strikinglycdn.com/files/ef1214f2-f0b6-425b-82a4-95d93bebca02/archives_principles_and_practices_la.pdf
    • https://s3.amazonaws.com/fusidejebi/6551556984.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_off0000c7cb.bin
a86b232c997ef04aa32bb8ba1b775d40957756b46ab25bde3d4a855774696ed7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 5004 bytes
font_01_sfnt_off0000d8d2.bin
3a584670ac8f449cef3a33331551004a36100dc8eeb5bbf02da72e866ede9b3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 10452 bytes