Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fb6aceb86b5307…

MALICIOUS

PDF

83.4 KB Created: 2021-03-28 18:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca79c2497247ee56a6ce84553df5113b SHA-1: a3250200fa4c1fedfd3ba7bc360a2e54c781ab8d SHA-256: 05fb6aceb86b530754e3690be31c3aa14fd6c5fe48cc3b8fea90930323392148
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits multiple high-risk heuristics indicative of malicious intent, including ML classification, security bypass instructions, and a lure for browser extension installation. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO poisoning attempt. The document likely aims to trick users into downloading and installing malicious software disguised as a necessary update or plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 9

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=download+idm+tanpa+serial+number+2018
    • https://vodakobawuvij.weebly.com/uploads/1/3/4/6/134627811/6410068.pdf
    • http://tofabukusakuni.22web.org/78026848246.pdf
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/64535f8.pdf
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/2284962.pdf
    • https://cdn.sqhk.co/sovokeduseb/jdjfRGF/disney_sorcerer_s_arena_best_characters.pdf
    • https://cdn.sqhk.co/zenetofuma/089hbsL/space_invaders_arcade1up_mod.pdf
    • https://cdn.sqhk.co/wusezofetib/bjcNhjm/draw._io_github_wiki.pdf
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/2373967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kajomeki.epizy.com/aruppukottai_akka_ponnu_song_free.pdf
    • https://s3.amazonaws.com/vipinib/que_come_oso_de_anteojos.pdf
    • http://vusedew.myartsonline.com/pozezaniwozimalosixupav.pdf
    • http://nawexox.epizy.com/bookcase_platform_bed_queen.pdf
    • http://rexefobixavater.myartsonline.com/grimgar_of_fantasy_and_ash_light_novel.pdf
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_33d9accd1a8543e9938fef273ce57d46.pdf?index=true
    • https://s3.amazonaws.com/julexekubaj/ambala_weather_report_tomorrow.pdf
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_de21aafe58174a6f88064fa6ae198b7e.pdf?index=true
    • https://s3.amazonaws.com/luxelula/the_things_they_carried_ap_essay_prompt.pdf
    • https://s3.amazonaws.com/bugutaj/35395564720.pdf
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_047ee49b51cb4960bd2223046c97fb85.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_cf105b8980a84d05ad7283f919c39edc.pdf?index=true
    • http://jitizukot.rf.gd/jezexilabamutifosejevo.pdf
    • http://zobawukesilebaf.epizy.com/bollywood_songs_video_2017.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_off000104d6.bin
ccaf1c816d623758a8a0bd9fc762343f3038695af2260e4e1b6d9b9aa51f2c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 5856 bytes
font_01_sfnt_off000118bd.bin
d82c19b609fec1cc2687dae7246e8d17b4c661bb0e0f956bd97b1bd4ebe49fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 11584 bytes

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