Malicious PDF — malware analysis report

Static analysis result for SHA-256 567932f5acb4e2fa…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 15:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d402c40659a6937a6e21ac2cc512f0aa SHA-1: 3525de5ed2a448175ba11c183e3e67a4b484e4d7 SHA-256: 567932f5acb4e2faf0d46172336bd104659d0aaef77186bf3809c455f977c23a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristically flagged external links, including one identified as a random URL likely leading to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to download further malicious content, fitting the profile of a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://eortak.com/img/fck_temp/file/76236255826.pdf In PDF document text
    • http://wsp.pl/userfiles/file/33340801036.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/fipikenobonomukudifezape.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/36750497217.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/84806098449.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/21706207968.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/40931525522.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/27448537731.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/3611380652.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/viwemuref.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/6454287746.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/54937296967.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/99718830610.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/mejotodu.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/nitojibix.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/53829764.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/wasinujomawa.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210609001735.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/45624744114.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/51234536693.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d5635035---tedumaxuvumewebunutameli.pdfIn PDF document text
    • http://packamate.com/userfiles/radagiruzudeboxo.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/44876235122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=prelinguistic+skills+checklist+pdfPDF link annotation
    • 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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 10812 bytes
SHA-256: 04e63e38d9362e3efa6aa6f7b70d0ab8b1ab1293dbc0848271abccfe5ce872d4
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 18820 bytes
SHA-256: 0fefb5a517e53e1c853494b80ef6c3cdb2e92c0f801dab163de2c4b1d3d7a729