Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d8c9185f757e77…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 01:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ceca3b628f46fb8ac5cbd6103d4bb52 SHA-1: 5a1a527d6aaaba8fb8628ec31f1e77eeb120e5ee SHA-256: 45d8c9185f757e774d631fbb157df8286715fb4e121bbc20d6b5b88d0c6bf429
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button heuristic further supports a deceptive workflow aimed at tricking the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=fundamentals+of+database+systems+seventh+edition.+ramez+elmasri+and+shamkant+b.+navathe PDF link annotation
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/simulozegokire.pdfIn PDF document text
    • https://dugemitisij.weebly.com/uploads/1/3/1/4/131409309/tujarum_jisuwalin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fd274e49d04a.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/ihiajgo/12598300908.pdfIn PDF document text
    • https://cdn.sqhk.co/mebosuxular/Ugey3ie/ultimate_backgammon_classic_dice_board_games.pdfIn PDF document text
    • http://hdsamara.ru/470556240602aqw8.pdfIn PDF document text
    • http://medakijizu.22web.org/grid-_template_columns_repeat.pdfIn PDF document text
    • http://cozyplacefor.rest/chanti_movie_audio_songsiblve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_6018771c2f4e2.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/3n8LwDT/17607617547.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/8822992.pdfIn PDF document text
    • http://stavki.link/5852463481037p9h.pdfIn PDF document text
    • http://watogoda.mypressonline.com/455033263.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/sports_illustrated_cover_2020_56_years_old.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/letuwemezaku_vewipejagetixo_xabop_mumapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5ffa6520b1eb1.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/geiemia/wifi_file_transfer_for_pc_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xagejinije.rf.gd/digital_library_software.pdfIn PDF document text
    • http://gowamatul.epizy.com/what_is_the_purpose_of_avro.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 5552 bytes
SHA-256: 40abe65e7fb91ea30e344b0115358b27136849cac673882809f9d64e31a0c29f
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10692 bytes
SHA-256: 196afa4eb81ab1ce76052d38992a6738b53c6514e9b0482762b3fa9f02a00ad3
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16824 bytes
SHA-256: fefec1b30e2abefe9b2905d1730304722095edbe62c91ddbb822ba5e3fdd0cb7

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