Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab26e25a768b1506…

MALICIOUS

PDF

71.5 KB Created: 2021-01-03 12:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 37aaca39183344bb69b35bdde7165624 SHA-1: 742ce3686f5d7392e8b40bc5419624f42cadcbe8 SHA-256: ab26e25a768b1506e83dba599b523b4494fc7798f8ca027a64ec5e15da01684b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed as a link farm on disposable hosting, likely to lure victims to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://gettraff.ru/aws?utm_term=cassette+tape+song+request+template+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5fc94b0c5ad29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f87a24f81ba8.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/c896d9e22.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/BjdWcor/farm_animals_for_sale_in_houston_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_5fc95cf2be74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_5fafa38586864.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/9263567.pdfIn PDF document text
    • https://kalokiran.weebly.com/uploads/1/3/4/6/134632324/vosuwumiv.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/jinabisura/zapupisubedediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4fd8a9-08e9-4a7f-97da-5de4f7fe4d6d/wexobopa.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/14134257951.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/pioneer_mixtrax_manual.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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 5252 bytes
SHA-256: 0b10c77ce23a32285af71663c9c3e5a4cfe5c423829df73ab8d69ac826f43ec3
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10260 bytes
SHA-256: 63b707aa154f0f0487e0d4f934e31f7b350b440cc097f77569d28b3f9a03c5d1

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