Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b2dbe08de6d4a…

MALICIOUS

PDF

82.5 KB Created: 2021-03-01 01:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70fb17031f2d9fc3f4d7d7a694919f1a SHA-1: 7a55a1a723b5c39bbf527cd98b86d72dfbb1d9e3 SHA-256: d39b2dbe08de6d4ab5928a99444e01f3bbfca78befc4bfee9ca646f38e6874b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://dafemum.ru/aws?utm_term=roadmaster+24+granite+peak+girls%2527+bike+light+blue
    • https://cdn.sqhk.co/vukupamita/uqiegjq/kezid.pdf
    • http://center-san.ru/83694528123wq0bh.pdf
    • https://cdn.sqhk.co/bezizafosu/jEicjfH/2168317767.pdf
    • http://gifinibufenatar.medianewsonline.com/58254348396.pdf
    • https://cdn.sqhk.co/womawuxinuge/fibjTex/best_base_clash_of_clans.pdf
    • http://pedalini.club/biminukobokulurodikiryq5z.pdf
    • https://cdn.sqhk.co/wadupaxi/khdijgd/obstacles_definition_simple.pdf
    • https://cdn.sqhk.co/rujoremebi/xTHighF/36386836357.pdf
    • https://cdn.sqhk.co/pesuxitum/chjehjS/6475731810.pdf
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/8e3db9f4f1b96bb.pdf
    • https://cdn.sqhk.co/bewewojiwo/hbhjdhb/entry_level_project_management_jobs_denver.pdf
    • http://manamuposa.getenjoyment.net/64897784142.pdf
    • https://cdn.sqhk.co/xumifutave/aMsii41/chandler_bing_crazy_snake_man.pdf
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/vitipozikimogat-mejinojozis-tupabun.pdf
    • https://cdn.sqhk.co/tixukiko/jgFuPnC/34141734745.pdf
    • https://cdn.sqhk.co/lebudawojafi/a0ii2kT/24859779185.pdf
    • https://cdn.sqhk.co/zeburozupax/iije8FH/bisokixemogenazuwesi.pdf
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/7367765.pdf
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/xudevaki.pdf
    • http://usene.xyz/90379196162ntvnu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001010c.bin
d4352988fdadfa436a57eb7c5b8fd5843a09c8df0650ee4a7d380d50ee70a574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 5840 bytes
font_01_sfnt_off000114d1.bin
e29b26f467f2af25a8734c5d3ba2b957bab7e459889404dd7f807eaf03e6e090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 11696 bytes

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