Malicious PDF — malware analysis report

Static analysis result for SHA-256 21364659dfe78e28…

MALICIOUS

PDF

87.7 KB Created: 2021-03-15 19:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 339a6ac6386d5daf4f81630af8fc6d29 SHA-1: 4121b7e87730df15ce250e3ed986f16b1d4366cd SHA-256: 21364659dfe78e289821642e21703b7ffccec98301ef0e655976411520fe7859
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing, with one prominent link pointing to 'dafemum.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=circular+motion+pdf+class+11
    • http://raisinshub.club/kilinaphxs7v.pdf
    • http://neyroskakalka.site/acronis_2019_iso12nz2.pdf
    • http://wrestling-mma.com/what_is_the_salary_of_a_guest_relations_managerh2ya8.pdf
    • http://prizinsta.info/sagujubogaxemibupk7jg2.pdf
    • http://beststudent.space/worldview_testlhure.pdf
    • http://hookup154.online/61074966630w7w2m.pdf
    • http://avtoshtorki.shop/management_functions_include_which_of_the_followingth1aj.pdf
    • http://yourbigdick.space/5737784802xziti.pdf
    • http://hayatevesigar.online/annovi_reverberi_pump_xrv_4g.32djnvf.pdf
    • http://salearea.pro/256441026409a7q5.pdf
    • http://feelslike35.com/54055317078crqfs.pdf
    • http://nicechange.space/briggs_and_stratton_repair_shops_near_men663c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/jepinebawo/the_shack_chesterfield_missouri.pdf
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_948ee1ccbccf428a85ff5a5847b8b50d.pdf?index=true
    • https://s3.amazonaws.com/povodijirig/ropinulatogonenunuwe.pdf
    • https://s3.amazonaws.com/kuxuxemu/56691808476.pdf
    • https://s3.amazonaws.com/jonora/zilinadinakupajuxiko.pdf
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_2661f234d17140c786a927462d4c6161.pdf?index=true
    • https://s3.amazonaws.com/tazibabebamep/ligunewumofonodakosepi.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_off000105c8.bin
2b176d5169d5e7dc8baa0e771299060d243a8665dfc88161b55bd68123233452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 5256 bytes
font_01_sfnt_off00011795.bin
f92c86ef81cc7d17c578f9f173d87b02bf2d01b39d2f93ffc200e2875bf25234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 12976 bytes
font_02_sfnt_off000143b1.bin
c33a3a40810c30b384d4d3a40ab5875e4c2dfddf59eca896068652f8993c969c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 3440 bytes

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