Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f380bb21f04a71…

MALICIOUS

PDF

92.0 KB Created: 2021-03-13 17:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c15760f42ba1af2034bd0cf765bb7a95 SHA-1: 98b990fa3fcd5e66575bce4b5f6a3c54f39ed6bd SHA-256: 26f380bb21f04a71ffe610979507c8e91da27ae2ac5b58205073740b8006cdcf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, including 'midufefew.ru' and several 'weebly.com' and 'sqhk.co' subdomains, which are likely used to host malicious content or redirect users. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=empires+and+puzzles+best+defense+teams
    • https://cdn.sqhk.co/tazurusubiz/fPIQzQs/digestive_enzymes_supplement_benefits.pdf
    • https://cdn.sqhk.co/suxevevagova/gNZJMsP/11800128907.pdf
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/412892.pdf
    • https://cdn.sqhk.co/zuronenom/idTgf9o/jonasotezunes.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/4261042.pdf
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/6885417.pdf
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/5fa9ffb294bb.pdf
    • https://cdn.sqhk.co/tobepeliv/MLiehe3/cheat_sheet_for_the_voting_booth_nc.pdf
    • https://cdn.sqhk.co/nizufalagef/7ghCnSw/cartoon_avatar_the_last_airbender_movie.pdf
    • https://cdn.sqhk.co/rowalulo/jlhgjgc/paralyzed_nf_piano_sheet_music.pdf
    • https://vosegatibi.weebly.com/uploads/1/3/4/6/134697540/fazagufija.pdf
    • http://xasujaru.22web.org/man_booker_prize_2017.pdf
    • https://cdn.sqhk.co/fuvopone/0iZwjh9/dj_sound_fx_80_download_mp3_2017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nugafafekovad.epizy.com/guwulujesifez.pdf
    • https://uploads.strikinglycdn.com/files/24412b26-c806-42b6-b350-bd9a5a1080d0/5th_wave_book.pdf
    • https://s3.amazonaws.com/kezemiradigu/eyewash_station_inspection_template.pdf
    • https://uploads.strikinglycdn.com/files/1a949f48-9e51-4197-8230-a59a94641cdb/wixin.pdf
    • https://uploads.strikinglycdn.com/files/10d115ac-6acd-474b-bee9-5d8a53461bb2/98373523493.pdf
    • https://s3.amazonaws.com/xupovobejanam/blank_bass_tab_template.pdf
    • http://vodulisus.rf.gd/fur_elise_guitar_tab.pdf
    • https://s3.amazonaws.com/juwofuxufijup/defufokigajebinexegilinem.pdf
    • http://fijibiwuweze.rf.gd/vafibuwizozudogoduxilud.pdf
    • https://uploads.strikinglycdn.com/files/aa143af2-df82-481f-a028-1e56fbe8199d/puwifabalatobaxupuj.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_off000126a7.bin
6a7c58fc41e2500a685774b41817c91cc4d445e25fa9b066bec3d250577caab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 5336 bytes
font_01_sfnt_off000138b6.bin
bc806d15f0d5bf0914f180ed22a29a9cb5e394b2cfa17ce243aa99d348be9b31
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 12556 bytes