Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d6fe9013f78743…

MALICIOUS

PDF

67.2 KB Created: 2020-11-17 15:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 03452342a70fc43beed3bd8c5ee79223 SHA-1: 00f3b6a84131801b4fdfe79881439a2d4162ad18 SHA-256: 77d6fe9013f78743e037fa4558b3609902fa780f87e21c7264c8893dedadf878
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external PDF files, many hosted on disposable domains. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The presence of a link to known malicious redirector infrastructure and a high ML classifier score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/wb?keyword=automobile%20magazine%20pdf In PDF document text
    • https://ranuxibat.weebly.com/uploads/1/3/4/5/134595997/3054540.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/1012737.pdfIn PDF document text
    • https://xalusadi.weebly.com/uploads/1/3/4/5/134595224/wegawilev.pdfIn PDF document text
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/vodujozapi.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/8452732.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/bopomo_pefulogovu.pdfIn PDF document text
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/7498200.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/1754145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8820ae6-9757-4c16-be3b-52b0afda8626/wuwezuxawipafuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e5a04c-0102-421b-8a18-f04215767712/47156779717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41c7f08-f862-496c-a419-b30a13b1f846/fuwozujisi.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/poxenokuxogabovokijutabuk.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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 5264 bytes
SHA-256: 79771d31e4aa7f05558f4435066fc16449806be4044be087c16df84caafc68df
font_01_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 9812 bytes
SHA-256: 30d839a1fee87c5f7acd7999eb815c2f85629b7a1cb945bc776b76ca13ed524a

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