Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1bdfdd03d7fe21…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 20:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5930f88722953de4223780ef461bd60c SHA-1: db4058610112bb2b719d05a4a94628d03f3a9e4f SHA-256: 2a1bdfdd03d7fe21651f266b09011a625980698ceca73b75a33d539a80bf34db
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLICKFIX' heuristic suggests the document instructs the user to press Win+R or paste a command into a terminal, a common tactic to bypass macro restrictions and execute malicious code. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, indicates a likely phishing or malware distribution scheme. Although no scripts were explicitly extracted, the overall structure and heuristics point towards a social engineering attack designed to lead the user to download and execute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://krisoc.ru/uplcv?utm_term=turn+usb+debugging+on+broken+screen PDF link annotation
    • http://tbeaindia.com/userfiles/file/sofabidowu.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vojogisetabitivefuxiv.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/92728562404.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/wetadiruvas.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dafavud.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/75580227819.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/99712910080.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/vejiretiboneluba.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/73831367858.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/94142997914.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fowuvatitulorejufedu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/jivemekelovuxabek.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/legafalewuwefepot.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/ramuruvotojumeden.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/batukabegiluximukeva.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630637867.pdfIn PDF document text
    • https://aokman-drive.com/d/files/nimolemezagepofixijo.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jixekabufewufolozu.pdfIn PDF document text
    • https://dintek.eu/uploads/file/noliwamuxipusagoburot.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/javijonirudodowi.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/682082375.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/monuto.pdfIn PDF document text
    • http://marketingnews.fr/images/file/32269617558.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd892e60fa---85355361243.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://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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10532 bytes
SHA-256: 434b270939468add89218ef1c3026255d53aae0f9c6d6af3b979623d6cdefdc7
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 18008 bytes
SHA-256: c3eea29b6f0032ab4acecc0df475d02a7d7ac632f1d30b7ac652f783173d5887

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