Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c404417520a4bc7…

MALICIOUS

PDF

69.2 KB Created: 2021-04-01 05:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a573a6f17f7b12a7cb98135ed9fe4e8 SHA-1: 84f8905f5fe7467ff07766434ed24fcba0a1a89e SHA-256: 8c404417520a4bc7fbc42371c98e56c75fc4260e361eac147b57bfd94549ec7a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=peterson+field+guides PDF link annotation
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/wiwananuriw.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/226bba3d.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/87527054200.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/hbhahaJ/pictoword_level_262.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/sonicwall_tz_215w_end_of_life.pdfIn PDF document text
    • https://jigirefijeg.weebly.com/uploads/1/3/6/0/136097222/6355364.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/lomow.pdfIn PDF document text
    • https://xurafexejigaf.weebly.com/uploads/1/3/4/5/134588012/808ea.pdfIn PDF document text
    • https://zuzagidebosoxe.weebly.com/uploads/1/3/4/3/134391670/vizirorujexenu_nabetegeboxe_kolumomizukowa.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/jhjaohc/vediratofuvidebobevifusow.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/fdc05d5.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/giheidO/walunexopizijiloloxireg.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/2539a3a1f24d.pdfIn PDF document text
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/votof.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/kukezuluv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/careless_whisper_sheet_music.pdfIn PDF document text
    • http://kuwubunaxube.rf.gd/what_is_a_synonym_for_moonlight.pdfIn PDF document text
    • http://kowelakava.rf.gd/when_to_capitalize_fixed_assets.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/mojifafutilavev.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/43586924138.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/89219021627.pdfIn PDF document text
    • http://dapesom.epizy.com/29682763154.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/tawegugexibexikebij.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/honda_gcv160_pressure_washer_not_building_pressure.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 4868 bytes
SHA-256: 134112c83ab83c41abef4c0e4ea37916c099c984e7fe19f85be40ad4f1a6956c
font_01_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 10316 bytes
SHA-256: 5e6c6431efc69765ae2a6c06ac0966226e68b5dfa88aa7eaaeee0c564674de87

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