Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f185256d14ffb1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 11:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a725bc0ac16d5da7b166592506d0623e SHA-1: 10a110425708bef9020edd14d1abfaf240eb26a4 SHA-256: e5f185256d14ffb12b2a270e7084d5883b5b035a6c816b9f4be4e7f71b32fd0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=high+heel+homicide+movie+watch+online PDF link annotation
    • http://handsonmontessoripk.com/userfiles/files/bomobivifabexuxibomemew.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/067c53247cf99b217bd888538bdfd1cf/53185467563.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/5870093469.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/6687805705.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/33601935158.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///36716393304.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/rurubevafuliburuvotuxolox.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/78234054773.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/timozeluzivigukiwo.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/rijuf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad25578263---fesov.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/81454368826.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210912_6FEA1FD364C815F4.pdfIn PDF document text
    • http://drironcat.com/images/file/6271162182.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/60536283618.pdfIn PDF document text
    • http://ssp.by/var/upload/linojagibagufutomiren.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/zigigivito.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/84957591728.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/87422692857.pdfIn PDF document text
    • http://annabarons.com/files/files/vekedukof.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/8404411083.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_off0000bec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 17844 bytes
SHA-256: 75ce94ec8f69d9a4558f5179a8e95376e169a81103862b99139567db3f882d25
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 10692 bytes
SHA-256: 655a51824c17affcd9f96a251174121f22547e399075ef21ef9309bfdd9b56fa
font_02_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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