Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ef9bea726000d1…

MALICIOUS

PDF

63.9 KB Created: 2021-01-11 00:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 05383673bf218db2dbeb15190f1c260e SHA-1: e7ffa8e681e98a465a471ebf7a496327844bfa4d SHA-256: c0ef9bea726000d18adfacb6baed096a68d29c22af264196f79afb961c84709d
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various external websites, many of which are hosted on disposable domains or known redirector infrastructure. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://ggtraff.ru/123?utm_term=ceramic+water+dispenser+with+tall+stand In PDF document text
    • https://cdn.sqhk.co/fetedudi/zheOgjN/43408356325.pdfIn PDF document text
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/2dda099.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/hvXeNha/kung_fu_panda_full_movie_hd.pdfIn PDF document text
    • https://site-1174809.mozfiles.com/files/1174809/find_the_ball_s_initial_velocity.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/7652382.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/bGjihcu/nilojapefalifineti.pdfIn PDF document text
    • https://ropoxazuwaso.weebly.com/uploads/1/3/4/0/134040565/gakesibekav-bupomer.pdfIn PDF document text
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/c6ad72ce83926d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5fa0daae3318b.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/jbghJii/american_football_rules_explained.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f95f0719f3ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fc868f43aca0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 5308 bytes
SHA-256: 658f5932a43a17f8184ceea7cafb385cd8e382d4d38a800bb6c8b7c0189bc8b1
font_01_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 10940 bytes
SHA-256: 93fe2fe0a90e1bc41ac8a52bfddb855bd38349eb982c097b0b181dd72211ac0b