Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4d2796387ed285…

MALICIOUS

PDF

61.7 KB Created: 2020-12-26 16:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c2b5128c3223c98b8ee283028bac1dc6 SHA-1: c8cf15f79f0920af2ac075c408801883bc071988 SHA-256: df4d2796387ed285c6f5f74d16a9c9da0f7df760664e27b594542bccb493220b
214 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to mimic search results for popular content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://traffine.ru/aws?utm_term=patala+bhairavi+movie+songs+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f8c791012ece.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/1249403.pdfIn PDF document text
    • https://cdn.sqhk.co/buwozumu/iidhinz/ruviluti.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/RvjgfN4/dental_experts_mn.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/Eibjgie/31700880077.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/hgCChbO/zawusonumetijilubavaw.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/1M8ijdF/guitar_flash_2.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/biigigg/bimunekeseritosazotutar.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabumumiw/hacGhf8/warufurejeporevoko.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/2695848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5fd389765dc05.pdfIn PDF document text
    • https://nidobafimenute.weebly.com/uploads/1/3/4/5/134526671/vuwenibu.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_off0000b44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 5384 bytes
SHA-256: 762642a1efe87ee393eff9eeeff90a0cd4c7e6f6319382c69d0de589af37d2d6
font_01_sfnt_off0000c679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC679 10088 bytes
SHA-256: 47e3e83764037b1ab29502d70b38d9852fbfcbb6194b266782e54545e6de7acf

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