Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cb420d2b569bc1…

MALICIOUS

PDF

77.8 KB Created: 2021-03-24 04:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027aa7bf841c6b4f7dcef240a509d553 SHA-1: b1c0f7dfe757b6f5faf2b75f7d895d8a64010e91 SHA-256: 40cb420d2b569bc1dad3ef9b529fe1c7fe34da979c093abfac88bfd58111a675
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://dafemum.ru/strik?utm_term=white+tiger+film+trailer+deutsch', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/strik?utm_term=white+tiger+film+trailer+deutsch
    • http://monstergym.ru/kindle_touch_d01200_updateycs16.pdf
    • http://reduslimitalia-ufficiale.site/ingersoll_rand_2475n7.5-vtslp9zu.pdf
    • https://static.s123-cdn-static.com/uploads/4411714/normal_5fe15453a75ad.pdf
    • https://cdn-cms.f-static.net/uploads/4369306/normal_600c1d25d808e.pdf
    • https://static.s123-cdn-static.com/uploads/4390663/normal_6004b8d258b32.pdf
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5fdaa92806de2.pdf
    • http://nigasheff.xyz/70751459189f0x7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4cd3cd09-5296-45ea-941b-84777e8bcb99/38839580976.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_6441a1fe53004134b335dd30d4f105df.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_37ad769d128148358bfb5df40e504402.pdf?index=true
    • https://s3.amazonaws.com/xanunafojuloki/bauer_bodoni_italic.pdf
    • https://uploads.strikinglycdn.com/files/43e759e1-8dd9-4699-9e57-d5b4d497b637/how_to_do_a_fools_mate_in_chess.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_c701ed2d8c7d4ca6aac363f2a85d38da.pdf?index=true
    • https://s3.amazonaws.com/bakoloj/89621184034.pdf
    • https://uploads.strikinglycdn.com/files/7cc182f8-2278-43dd-8d1b-4474903721ad/sears_lawn_mower_service_center.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_87d984cb4fd54476bac69e82a8bed0d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b595062b-17da-47e1-b11c-2b50e61a25cb/1216016686.pdf
    • https://s3.amazonaws.com/wozoxub/harrisons_principles_of_internal_medicine_volume_1_and_2_18th_edition.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_off0000ef81.bin
b2640f9960272c28b455356364cf037b8431c9577cacaaf8ef49ff7d8d8a53c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 5448 bytes
font_01_sfnt_off000101f0.bin
d3b8a025688d629db5c6c09a524467337a8e6c373745848a152c5149b5773484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11536 bytes

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