Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc5b674703663f8…

MALICIOUS

PDF

87.7 KB Created: 2021-03-15 23:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4798efc7fa85d36e6bbe8aef0ab34b5e SHA-1: c22f08cac2865ef93938d047ae2490d5ba86861e SHA-256: 1bc5b674703663f809e5581d53596201ab8246b24afcf1470c1cb523649af393
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to 'vilenefex.ru' and another to 'xtreme-sport.ru', suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=catcher+in+the+rye+chapters+18-21+study+guide+answers PDF link annotation
    • http://xtreme-sport.ru/dungeoneering_token_farming_guidea1lhe.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/fanexavobi_metusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_601a30ed37b61.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/calvinism_vs_arminianism_tulip.pdfIn PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/6366382.pdfIn PDF document text
    • http://7gusevshop.website/fasigavusugunuhw00q.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/kangaroo_epump_customer_service.pdfIn PDF document text
    • http://trydouche.xyz/the_strangest_secret_booktopia2icxv.pdfIn PDF document text
    • http://levantemosaic.com/how_do_you_winterize_a_hayward_h_series_pool_heaterxf4nh.pdfIn PDF document text
    • https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/dowemilo.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/2699497561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_6011552bf025d.pdfIn PDF document text
    • http://stickerrus.ru/wuzikepebidajakolejomibamro5j.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/zukuwozurezewawuzivu.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/2ad127859248db.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/dumupa/jopaseparukajax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c90a309-34f7-4ef2-a79b-d6bfc5515fcf/kitchenaid_repair_shop_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ximilifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4824955c-d55d-4617-a71f-2d2d79098f6d/47396774631.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/illinois_constitution_test_answers_2017.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_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 5812 bytes
SHA-256: 91cbe704c9236b512d5fb08bcecae0e2038257d7c1f34f9265404f7fb36a48a4
font_01_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 11172 bytes
SHA-256: 6a60952f1f9da27e987d275e90377bc31887ec63efdf54cc4dd82bc9b6bba4ed

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