Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b641a2f729c483f…

MALICIOUS

PDF

75.5 KB Created: 2021-04-06 07:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 684c59463dec00a264ed542ad93e1453 SHA-1: 10507effc1fd58959645930f101f5eea121bb198 SHA-256: 8b641a2f729c483f8045451238797f3a628fd3bdb40ecc517081ee452fab80b2
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 0.9998

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://fokemale.ru/strik?utm_term=punctuation+exercises+with+answers+pdf+for+grade+3 PDF link annotation
    • http://samyog.ru/781896717621f5xi.pdfIn PDF document text
    • https://lanokonemuke.weebly.com/uploads/1/3/5/3/135309959/2553561.pdfIn PDF document text
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/3526795.pdfIn PDF document text
    • http://fortuneo.biz/ornamental_horticulture_tnauwybex.pdfIn PDF document text
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/kelal.pdfIn PDF document text
    • http://rentline.pro/98_honda_shadow_1100_battery_sizeq8azs.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/fasojepakeraxapivabu.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/zakefo.pdfIn PDF document text
    • http://prizinsta24.online/lipevonokaxofohhntb.pdfIn PDF document text
    • http://copyright-rules-help.com/mr_coffee_10_cup_stainless_steel_carafe_replacementq3pot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_53b880083eb648e2887169b1833f4f62.pdf?index=trueIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_d52b3e4b45e9407fb7d559f6d11b9bdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/xoduruseguja.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_fe327a7b53f1428fae56acb149233880.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/59802551245.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_9cf5a4aa6b7d484eaa3925cd9e4cabdd.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_a76fd7a391e54ce88ca093ef018a4cdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/define_activated_sludge.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/kugekufagikesajevosu.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_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 5712 bytes
SHA-256: 2d922ecda7923f8253d4e1ca8c6bc22173a85b19fd57047e9f38a5da7c6422a5
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10832 bytes
SHA-256: 51fcf3ff382eee8e2d392653909b461f06420ad6e19a3e55640ddb450ff1726c

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