Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4966d69af85ab89…

MALICIOUS

PDF

77.9 KB Created: 2020-11-23 04:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb2ded41c01f960343d0d6513689f614 SHA-1: d36817b59ad9c078b7a9cbde4ca50ddb021db596 SHA-256: b4966d69af85ab891fcdad0f0a0d1abddc795d9364f5964995c9dc67666d2bc3
244 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier also flag this PDF as malicious, likely phishing-related. Although no scripts were explicitly extracted, the nature of the link farm and redirector suggests an attempt to lead the user to a malicious site for phishing or malware delivery.

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://traffking.ru/aws?utm_term=disturbed+sound+of+silence+flute+sheet+music In PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/852591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_5fafaf0e7ffba.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/vegazimopewot.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/2091284.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/2b88badc5.pdfIn PDF document text
    • https://givudaxoj.weebly.com/uploads/1/3/4/4/134490896/3086335.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/776913.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/rutifik_bebovi_wofima_vigol.pdfIn PDF document text
    • https://gegovufefole.weebly.com/uploads/1/3/4/5/134520867/7165313.pdfIn PDF document text
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/simamuv.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/bisute/86104873481.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/29529355473.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/balagepatufejuxeturewiwed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e536a4-5ca3-4d15-8e1b-f602b69b1835/wojorozoxuxukazukokab.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 5188 bytes
SHA-256: 7edea5eab4ebbb53a9d3376499e4289d290376aa3ac344a7451aa7b99dbbaed0
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 11136 bytes
SHA-256: cbec17c2d92b3316fb7407d37e061a61ed30ec27a4a8ac0077d5d343d5ef1bee

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