Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad945e33b6b8ea53…

MALICIOUS

PDF

104.1 KB Created: 2021-03-14 22:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91a1a6c8d1699100e5ec1110d5b68d42 SHA-1: 29b8b48e5cae47da81f8aad2b400ea56cb20148d SHA-256: ad945e33b6b8ea5392ceb00788768043b69907f4ffb6f9d4a3da30a87ee65993
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, forming a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://nipisod.ru/wix?keyword=cinderella+man+study+guide
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/0be9cabfad8fe3.pdf
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/e5b87a8c7ea.pdf
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/mafonasusifekafe.pdf
    • https://fexegidonowagi.weebly.com/uploads/1/3/5/3/135325594/najezafutepufasobem.pdf
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/wozexawiz.pdf
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/bitixilu.pdf
    • https://bixevojug.weebly.com/uploads/1/3/0/7/130739122/4051187.pdf
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/7240298.pdf
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/7821407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_e3e9f77cfd1a4c77b35296429f965d35.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_3b91e78ae40c41a1b4b66d20fd4387e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29b7e485-ee9f-4288-b5ae-9cbcf48156b5/45733022041.pdf
    • http://vedogitunenaki.rf.gd/que_es_el_lenguaje_verbal_segun_autores.pdf
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_34217ff2772048ce9432128ee1fa5fd6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccd0a729-e4c0-4fbd-85c0-48277867e0f4/fovosa.pdf
    • https://uploads.strikinglycdn.com/files/2bf66d96-ad97-4a85-bf60-2703462020c5/48010081695.pdf
    • http://kurejaj.epizy.com/hmrc_penalty_appeal_letter_template.pdf
    • http://zesivigodexewig.epizy.com/android_tv_quale_comprare.pdf
    • https://uploads.strikinglycdn.com/files/3c59c128-6a9a-45fd-8f0b-4ea64c7d96a2/acer_aspire_one_zg5_hard_drive.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_7ed80ac1b6284ea0b9ac6f89e5feb6fa.pdf?index=true
    • 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_off00015868.bin
e35988bdba180c0ecd84dcf9bc4258107ae478b2d523b150df9542a9222198bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15868 5152 bytes
font_01_sfnt_off000169d8.bin
ff2823744b05d40770a2ba6125e6a5d53b2559544ecbce614af173be93cb43ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169D8 11708 bytes

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