Malicious PDF — malware analysis report

Static analysis result for SHA-256 d769cd42a4e28c0e…

MALICIOUS

PDF

77.3 KB Created: 2021-01-19 11:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9277426b47ca3fb7f915cbf801ac5f88 SHA-1: ee12cb03b95c5af0f278e3625d7ab0b33b881e7c SHA-256: d769cd42a4e28c0eaa8ac28aac4f02e28fa96ff887301d9c21da27c5bb76da5d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of malicious links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=102+5+f+to+c In PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5feb26ae23669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff96f05140e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_5fdaefeabd2cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f909038ec44c.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/letter_h_preschool_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5f959e6fc06dd.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/1758403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_5fcf32fb7f3bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5fedf5fe7a75c.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/kirerametoxawefi.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/varolexexus/bugatti_car_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/poetry_chapbook_template.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/fowanu.pdfIn PDF document text
    • http://kojajopi.epizy.com/gi_bleed_guidelines_thai.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/59462565475.pdfIn PDF document text
    • http://debukigezi.epizy.com/elasticsearch_create_index_template.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/lejoba.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_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 4712 bytes
SHA-256: 08409a9fd1f1d231724a1b1fca96fc7842f3cea2cdd4ea3431ebd37925e2f0ad
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 10900 bytes
SHA-256: 19f9999250964637b6fc4317cc99fcd4a84030924c0c6e890372a7c5d3cf00d2