Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a920aa8b0719708…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 02:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83da9f469ad476c36ee6fd4305927abb SHA-1: 7c81c1a89242bc48346bac65dd9936b375e148c5 SHA-256: 9a920aa8b0719708cda47ab23f7d434f535e9deab2d9828a7bb565075ca403d7
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random URL links and a link farm on disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware delivery attempt. ClamAV detection confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=franconia+notch+state+park+map+pdf PDF link annotation
    • http://naturalmis.com/userfiles/file/jagufadunakipifed.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0vm5rcctoj8ge8t9sj80ja7bhf/27915538416.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/62dbfecbe4102cce5ad52ce4938efea7/61297972630.pdfIn PDF document text
    • http://kleiberit.ru/files/file/getedej.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109012002283097.pdfIn PDF document text
    • https://suksesunited.com/contents//files/88055806475.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/70226996842.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ae729f5fac1---9493845642.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/63155439574.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/52380933155.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/varunidegetitapitok.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a723915824ed2e2e7da050fb30e451e0/vogezaxesap.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/tezodipavitofa.pdfIn PDF document text
    • http://signauction.net/userfiles/file/wakoxevabu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/49918082248.pdfIn PDF document text
    • http://lejuriste.ru/files/file/kojakekedokerigujaj.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/43387860296.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/keluxogep.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/13658251378.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/11219536902.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f141086f04---gimama.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/biwafijonitufofuz.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/pajoxa.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/kusunujorupaxunimo.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/32796227319.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10908 bytes
SHA-256: 27693e5bb29deb6ab2f3c73a5181959abee7a001459a0289460d232c556e9bb2
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 17556 bytes
SHA-256: d47b6e1093efbf741b55fd4f6130357ea76e66d43d5df9520451cf590f3fb255
font_03_sfnt_off00012b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 19216 bytes
SHA-256: ad4fb3ab1b88b182972d0ecf63ae0648bd0f413320acd8b3d094955af1448e2d

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