Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea650dd2be697c1…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 21:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 710156b4fad9d8f4a78b1d32794e300b SHA-1: 5b7e7caefe1d37a80dad5008500bef1650806a40 SHA-256: 8ea650dd2be697c1f43b79c62c22b739a91a6dcee7c1b2b8421df2ab1c2863c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://xajibur.ru/award?keyword=bwv+1004+chaconne+pdf, which is likely used to redirect the user to a malicious site or download a payload. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/award?keyword=bwv+1004+chaconne+pdf PDF link annotation
    • http://gizigevom.mygamesonline.org/addition_and_condensation_polymerization.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/sewonadodekive.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/14426943514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_4df917fe116c4462a34f8ed17b67b61d.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_0c11332ddaaa4154a82fc60524f7c083.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/cmhc_rental_market_report_greater_toronto_area.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/9925927773.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/63231757577.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_6f89740161914527ae5e9ed260308655.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/sandisk_clip_sport_plus_16gb_review.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/roxetuxosulugabofiz.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_fd7089a2fff74fd2ac508c4e06ebd88a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumasun/medtronic_guide_catheter_selection.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/word_2016_shortcuts_mac.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_d298bdab42734cad9732c78d8efb4404.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/what_is_social_constructionism_in_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/jafizuwe.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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5420 bytes
SHA-256: a652b1513b2a53294922b18bb4d04183e247f5f8481208d9409a09e692b7ea0b
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 11896 bytes
SHA-256: b9ba88d8b660b918636896db084e6c29fa694066e1f84da8e2fe93d1af954bb1

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