Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d420a7d16c7c12…

MALICIOUS

PDF

74.9 KB Created: 2021-05-09 22:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea372726945c7be21e3c272df016b01c SHA-1: 9990a3c362ddc80d63d8dad67f62602fb026a26e SHA-256: b3d420a7d16c7c127334fc548011c80e50219f95889dd4ff96dddde654904994
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The document body, though heavily obfuscated, contains keywords related to 'Zojirushi rice cooker maintenance' and application metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content. The presence of external URIs and the overall structure strongly suggest a phishing or malicious redirection attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=zojirushi+rice+cooker+maintenance
    • http://robefixelajimod.22web.org/benirixesavofuzeta.pdf
    • https://cdn.sqhk.co/sigidezok/3gfoKyi/super_ninja_steel_episode_2.pdf
    • https://cdn.sqhk.co/mopewedote/Tihf8hf/bsmmu_e_registration_card.pdf
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/6460796.pdf
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/4029410.pdf
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/d21f1.pdf
    • http://xusonawifofi.iblogger.org/aws_bucket_terraform.pdf
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/4410807.pdf
    • https://cdn.sqhk.co/fifunolew/Kyhiyij/company_profile_design_template_free.pdf
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/magapakifi.pdf
    • https://cdn.sqhk.co/nakunadubux/gjihgpS/xegatafoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rumezo/gluttony_guide_darksiders_3.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_2165f44893f24544ae2e5b142a0849a8.pdf?index=true
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_7b9f101f48434a4ca673015d4dd0ebaf.pdf?index=true
    • http://vajitefafuxuz.epizy.com/notebiwit.pdf
    • http://dorofudi.epizy.com/bujujowar.pdf
    • https://s3.amazonaws.com/posaxugidut/81248108483.pdf
    • https://s3.amazonaws.com/sorogamat/69436319271.pdf
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_272350f24d18445c81d1d05716dfb533.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e3b285c-dabd-4238-95fe-d08945973534/what_do_dogwood_trees_look_like_in_summer.pdf
    • https://uploads.strikinglycdn.com/files/307c0b16-4b62-447f-9b79-5a1aac498044/manawafav.pdf
    • https://s3.amazonaws.com/pululusodogi/68247085942.pdf
    • http://pegudopujisofed.rf.gd/17128097190.pdf
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_33b027a2a29b4c72a5254c2245ce785d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin
a85e910c0793dd9015b22911850522017bd13154ea8f0f5832f1b6a8cb170f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5104 bytes
font_01_sfnt_off0000fa8f.bin
5efd7b6afac6a08e30e0e17c325248b514f4476eba3588cbeff2d8af83ba06e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10484 bytes

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