Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bb1aba8ca6f448…

MALICIOUS

PDF

70.1 KB Created: 2021-01-04 02:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d4ba7124f8a26acdef3f1152f61e4e SHA-1: 77472ec9d9ccd18fc66b0f0ede030e5472ff31dc SHA-256: 34bb1aba8ca6f44821898fb45f1292321ab71be4813752712158b96ef4d3c09c
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=hyper+heroes+codes
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5ff1df9161090.pdf
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fbf6627bda4d.pdf
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/nolidizow_dasowodixubi.pdf
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/rofulupakogevif.pdf
    • https://cdn-cms.f-static.net/uploads/4456663/normal_5fabad5e69f30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zazelujeju/nipupaganu.pdf
    • https://uploads.strikinglycdn.com/files/fb04d4bb-2239-485d-9825-6422ad07dded/jesijizer.pdf
    • https://s3.amazonaws.com/zamuriza/crofton_primary_school_ofsted_report.pdf
    • https://s3.amazonaws.com/fupanabivote/6276934297.pdf
    • https://s3.amazonaws.com/voxulija/81990447822.pdf
    • https://uploads.strikinglycdn.com/files/cf2a8d6a-ef86-46ab-8cf3-70edd4067ba5/97821510372.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d783.bin
25f4f363bb9187f2ecdfff45b2bb7a1f6d5d7c9a11059b53f65c0c4bff7c7638
pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 4980 bytes
font_01_sfnt_off0000e877.bin
90f4470a9c11c1bc57076a5362daa86377ff6142d5219a9f5fb78f3697bfbde3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10388 bytes