Malicious PDF — malware analysis report

Static analysis result for SHA-256 169bfbf44fb8d219…

MALICIOUS

PDF

70.4 KB Created: 2021-03-13 21:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34144c5b77fc2ffb20cc8d897a68d398 SHA-1: 4e6b7d1f240628f2a8472a7c7e3ca5c94ba829af SHA-256: 169bfbf44fb8d219ff6511859ee7185dccabda877dfe7a1974057487db96066f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' which suggests an attempt to generate traffic or distribute content through a large number of linked PDFs. One of the primary external URIs points to 'jumiwimov.ru', which is likely part of a phishing or malware distribution scheme.

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://jumiwimov.ru/wix?keyword=pokemon+revolution+hoenn+guide
    • https://sawebegiwe.weebly.com/uploads/1/3/4/7/134706463/ragab.pdf
    • https://cdn-cms.f-static.net/uploads/4470226/normal_601505197767a.pdf
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5feb6fd6b3701.pdf
    • https://cdn-cms.f-static.net/uploads/4463009/normal_601b1867ac043.pdf
    • https://sakiverore.weebly.com/uploads/1/3/6/0/136095660/446bf203f155349.pdf
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/memudonukunilazap.pdf
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/silukosi.pdf
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ffa52d785a79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97bbbb57-99d0-4546-aef8-de76aa7726b2/how_to_change_hp_printer_ink_8600.pdf
    • https://uploads.strikinglycdn.com/files/35daad31-877a-4f64-9511-5bc374c9a170/how_to_change_my_schlage_door_code.pdf
    • https://uploads.strikinglycdn.com/files/43b20fbc-1d74-4455-8a81-644cbf2c942c/71827648094.pdf
    • https://uploads.strikinglycdn.com/files/8fecb3e6-8f1b-4595-8b36-894f77b82909/three_stages_that_best_describe_the_progress_of_the_french_revolution.pdf
    • https://uploads.strikinglycdn.com/files/3ecf6e09-89f8-48b3-bbfe-51022f4eeb2a/zamapobukonedokatetud.pdf
    • https://uploads.strikinglycdn.com/files/38018588-ce7d-4752-be5f-ddec5d90ca20/vigudepipev.pdf
    • https://uploads.strikinglycdn.com/files/6b0ec46e-7b0e-485c-92f8-5554ffce58ab/fl_studio_mobile_12_download_apk.pdf
    • https://uploads.strikinglycdn.com/files/a290e9ea-3450-49ce-8fb0-01d57133f545/z_critical_value_table_two_tailed.pdf
    • https://uploads.strikinglycdn.com/files/bde42a2f-4d2c-4698-bb73-d8e0ed0a82b3/resistance_band_leg_exercises_youtube.pdf
    • https://uploads.strikinglycdn.com/files/b70cfd09-afd6-433f-b705-5a764e52bb2b/fotitekokuxadogulofo.pdf
    • https://uploads.strikinglycdn.com/files/9ad7f07d-2cc4-4a1c-9e96-cfc32eb5aa62/absolute_surrender_andrew_murray_free_download.pdf
    • https://uploads.strikinglycdn.com/files/24199833-9c77-48de-a2cf-5b5e25807f21/lawowuned.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_off0000d7d3.bin
d035553cf8d68cad4b28b7badefdfead7f08ad17a3ffef31121505c2891e4317		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 4976 bytes
font_01_sfnt_off0000e8a3.bin
b0892638ac649f8d6f8c42ebf33e6aaa4752739c93cce314176c599d408e62c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10224 bytes

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