Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd1256fc13d874c…

MALICIOUS

PDF

94.7 KB Created: 2021-03-23 08:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a82f1cb7fc01269ac2f32599da9f28 SHA-1: 1e224f13761c4327acf8a5baa371d12b76092f0e SHA-256: bfd1256fc13d874c77b07df506f59be6c49ebd755dbc94e964abade799590c7c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. The embedded URLs, such as 'https://kuzutuzo.ru/wix?keyword=how+do+scientists+classify+organisms+today', likely serve as lures to phishing or malware distribution sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=how+do+scientists+classify+organisms+today
    • https://cdn.sqhk.co/xonivozew/TaDF4AJ/8700993554.pdf
    • https://cdn.sqhk.co/jakufomego/heihbvP/the_apache_tribe_history.pdf
    • https://cdn.sqhk.co/jipogidara/yTv6pih/how_to_draw_cartoon_animals_step_by_step.pdf
    • http://lasleymarkt.ru/70513562674ffq0h.pdf
    • http://kejumazinanu.mywebcommunity.org/82886665500.pdf
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/wodivutaveno-dipuzapate-zaradusatami-somejinurelut.pdf
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/2670233.pdf
    • https://cdn.sqhk.co/mafowixodi/0ibji3e/juwijifojezatozi.pdf
    • https://ginozupil.weebly.com/uploads/1/3/1/4/131411281/5620648.pdf
    • https://powirubojeti.weebly.com/uploads/1/3/1/4/131482959/kofekakapezej.pdf
    • http://kebuwakuje.medianewsonline.com/mcq_on_web_design.pdf
    • http://shimano-stradic.ru/personajes_secundarios_un_mundo_feliztp6e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d228bab1-0a32-4d50-9e11-ab8e0bc453c5/old_ariens_snowblower_carburetor_adjustment.pdf
    • https://uploads.strikinglycdn.com/files/a857c64c-6302-465d-ae39-edc0ca90e7de/58894685252.pdf
    • https://uploads.strikinglycdn.com/files/905e6918-d27b-4202-a460-4c50daf9c25f/grendel_by_john_gardner_setting.pdf
    • https://uploads.strikinglycdn.com/files/f55efb32-6e28-477a-adbc-ffad14af884a/mugufeza.pdf
    • https://uploads.strikinglycdn.com/files/dc5975e3-4ab5-4631-938c-a63f67887cd5/kozezowi.pdf
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_b7d10f6f596f42e79bfbd5b244cf301b.pdf?index=true
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_3102f134cdac416f895a35a7aed435ed.pdf?index=true
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_e3994d75eb884b0ca64edb75b617f76c.pdf?index=true
    • 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_off0001275f.bin
cded9b5bb037c0da2892eb07e5d54a095ece9bccf890a205dcea068e779e9b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 5284 bytes
font_01_sfnt_off00013951.bin
613e5402f8db32b6b4ac7cd1c5fca8e959b976d588e41fa06fa40dde21ced8e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 11124 bytes
font_02_sfnt_off00015ec2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC2 4324 bytes

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