Malicious PDF — malware analysis report

Static analysis result for SHA-256 8283fe5b6f169d7e…

MALICIOUS

PDF

79.4 KB Created: 2021-03-02 01:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e72666e4145b557f0669eb6426d63c54 SHA-1: d8fb222b4983abcf4dbe8ece7baf5d1268c5a5c1 SHA-256: 8283fe5b6f169d7e10eb0bc7f7b6a3bbda4d1d325c8788e1abd161fda5f262b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, likely to distribute malicious content or phish users. The embedded URLs, such as https://kuzutuzo.ru/strik?utm_term=first+alert+9120, are strong indicators of malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the detection suggest it may exploit PDF vulnerabilities or redirect to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=first+alert+9120
    • http://daludaja.getenjoyment.net/what_is_the_minimum_value_of_fxx2-10x19.pdf
    • https://cdn.sqhk.co/josipinu/i4VhhVL/kapoxuguxewefokiga.pdf
    • http://dotixomovi.sportsontheweb.net/how_to_connect_sony_ht-ct780_to_tv.pdf
    • http://jaxagogilexet.sportsontheweb.net/the_squat_bible_download.pdf
    • https://cdn.sqhk.co/womilepeba/ehhhhZG/file_manager_for_android_2._3_free_download.pdf
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/c68c20ce92e.pdf
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/roneganexasinexuran.pdf
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/kutipov.pdf
    • http://pobesegu.scienceontheweb.net/what_are_living_cells.pdf
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/55adfb2a45a54.pdf
    • http://wugupomovupa.sportsontheweb.net/mebukivekogafudo.pdf
    • http://zugapuvu.mywebcommunity.org/nuvodeguwawetudazajakono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bokexizometun/dlink_ac3200_setup.pdf
    • http://gakilasefit.myartsonline.com/can_the_military_pay_for_my_medical_school.pdf
    • https://s3.amazonaws.com/fogibi/indiaresults._com_bihar_2018_10th_marksheet.pdf
    • http://pizuzol.onlinewebshop.net/74219038117.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec28.bin
a89cf0f7cc4ef95987612e14215e5e85869a0e0c0f1deb06a772b7c248dc2aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 4688 bytes
font_01_sfnt_off0000fc0e.bin
a5511951bf4ea238e4d1fd37a463914be4f8a11e15d9cb2e5303136865816291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10852 bytes
font_02_sfnt_off000120e8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 4324 bytes

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