Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c064cc83a6ea39d…

MALICIOUS

PDF

76.4 KB Created: 2021-03-07 20:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b354a778f4390774a67460ea7f2c2d69 SHA-1: 909c569f5b6122378e2f0a8e122c990cbfd47c7c SHA-256: 5c064cc83a6ea39d82cbe5ea370b8b0600b5063e0bfe591e347860de609e9a1b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites, such as the one at 'vilenefex.ru'. The document body, though heavily obfuscated, appears to be related to a technical support lure, attempting to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=xfinity+dvr+not+recording+series
    • http://lordtrans.ru/67932889041fwnve.pdf
    • https://cdn.sqhk.co/vujejanar/giigWge/gagumidenitebele.pdf
    • http://dfahsdfgjsfg.online/femurozovekupewijujo71jr0.pdf
    • http://metalllift.ru/66917796557chzq8.pdf
    • https://cdn.sqhk.co/lokuwanij/4djiSj4/mirror_salon_suite.pdf
    • http://gayerkan.com/97153754616m6e06.pdf
    • https://cdn.sqhk.co/xubipoxeguza/eQe2i0V/dual_federalism_example_ap_gov.pdf
    • http://rrrrkkkkk.space/vozosenakamokozimiu28i4.pdf
    • http://nyvelsets.online/android_studio_grid_layout_center76nav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_445da4ebfa38488699766747bed7fee5.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_3e4a520790c64161af10aa63d6691995.pdf?index=true
    • https://s3.amazonaws.com/dovulavavo/almond_cake_recipe_springform_pan.pdf
    • https://s3.amazonaws.com/xukanomarexumu/jopepofa.pdf
    • https://s3.amazonaws.com/sojebelevenex/temperate_deciduous_forest_in_india_wikipedia.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_476ebfeb389a45d19a75cf1c09c81860.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/junorotilogefejidowedam.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_2e704d90fb22483da0772483c6ccd8f5.pdf?index=true
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_f1a8c593036c4d3ebeb5e3c5ad7e84ba.pdf?index=true
    • https://s3.amazonaws.com/fezenur/43315766549.pdf
    • https://s3.amazonaws.com/mukut/jagojorumisod.pdf
    • https://s3.amazonaws.com/gofilafixu/debentures_balance_sheet_meaning.pdf
    • 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_off0000f02f.bin
1a316ea8987c583438555ed9e3789bdebf910d96000902ca4001969f61bb3246		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 5088 bytes
font_01_sfnt_off000101a1.bin
757b24fafe9b6173b176566768ac19d20065d408200c27b1fd575e6761825e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 9980 bytes

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