Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dba4b4656480f46…

MALICIOUS

PDF

73.0 KB Created: 2021-01-09 22:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f65e5338f9b685b62aeea4d1a1c7a391 SHA-1: afb793a5eb3d263ac7867e953c0d77426a854dc5 SHA-256: 4dba4b4656480f46eb24c7dca9bc8cacf66697f9343f6f2f2792985afa5b00ad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to S3 buckets, suggesting a link farm or content distribution network for malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to malicious sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?utm_term=local+guide+app+google PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5ff96cf9364f9.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/9139848.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/wesepa.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/Jjh1C2C/paintball_gun_stand_3d_print.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/6274856.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/mudiditajevifide.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/9923947.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/rezugekolaba/8777551687.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/words_that_begin_with_zo.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/spanish_1_syllabus_mrs.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/pepinan.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/61065824776.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/bukiratariwevebilexudi.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/elise_l_wolff_calendar.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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 4908 bytes
SHA-256: 2876a8029855b86e01e418b186217cf1d81dccb64547e3fbf9782d708f18ec79
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 11208 bytes
SHA-256: aab08ce00b540f9f26937028bc871a6bff652afd3bfdef73e6a4df8dc8726984

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