Malicious PDF — malware analysis report

Static analysis result for SHA-256 232947b3b4582d9e…

MALICIOUS

PDF

73.4 KB Created: 2021-04-23 19:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 496c24db1cb566f5abf18460c40322cb SHA-1: 6b2a24daf3bdf00cca553e1039aa835ccaa3f245 SHA-256: 232947b3b4582d9ea1a5a7d485fed296df706d9630370cee57d7944810e22a30
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on cloud storage services. One of these links, https://seumenha.ru/strik?utm_term=how+do+we+describe+a+jungle, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to direct users to external resources.

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://seumenha.ru/strik?utm_term=how+do+we+describe+a+jungle
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/649492.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/derazazinidamodoboji.pdf
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/betetusabif_bosisidonidepo_nexeturibexok.pdf
    • https://pitudonela.weebly.com/uploads/1/3/5/3/135323021/jisitigaler.pdf
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/7274789.pdf
    • https://jazedase.weebly.com/uploads/1/3/3/9/133997310/sodosimuved-fasonotinun.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/9029544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_26e69bcba57f48bca539e74dfa24c94b.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_ee6b7eb08b184d7ab3485ac15a81d67b.pdf?index=true
    • https://s3.amazonaws.com/nisiwanolom/cell_membrane_transport_lab_report.pdf
    • https://s3.amazonaws.com/woxotopapozokev/wixekifituvawimud.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_5d0447f7343e4507b3f2e13564d07a10.pdf?index=true
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_0665d82364d948efb4a2c88f104ac8ca.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/37000486271.pdf
    • https://5e7fdb44-65a6-4d88-9b36-b69c04d36e08.filesusr.com/ugd/b547b4_9aa128ee445a4bf5a462a4c3d95492b6.pdf?index=true
    • https://s3.amazonaws.com/pevarijidasalop/worksheets_on_reflexive_pronouns_for_grade_5.pdf
    • https://s3.amazonaws.com/pisedij/geelong_advertiser_job_guide.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_c34c004fd17d452294398848aff80ac1.pdf?index=true
    • https://s3.amazonaws.com/pexodugosa/jesakofuguj.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_off0000e29b.bin
bdcb58f37370157b8cf0ed05b4c173bf4b7dbb5dca49b2a0a20b3f6316b8188c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 5376 bytes
font_01_sfnt_off0000f502.bin
c9edff21eefe0bf1944029bf51a0f24cd7e40762fd148d3ced0adbf05b3ba30d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 10432 bytes

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