Malicious PDF — malware analysis report

Static analysis result for SHA-256 a740cbe79c8446d8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 18:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e989a0ea93f2f74f8388fd97a0cc5da SHA-1: d8366945292b6a74400ee42a14b6544154f856d4 SHA-256: a740cbe79c8446d86fbdc3727e00f1b1fa69fa04451fdc72258554730c5958fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are identified as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of external URIs and the nature of the PDF structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=location+mock+app PDF link annotation
    • http://chineseclothingonline.net/File/97331210075.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tatasakegeweduxizuwu.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xitobabusexukemowir.pdfIn PDF document text
    • https://ka-base.no/images_students/files/xaritomat.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jebatafabitegigafi.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/17288094694.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/52741248987.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/62160206894.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/585e4535a85e68031de62ff0a2160bb8/59421579328.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/49818659451.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/vumunuzulasupiv.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/vifaliwimabezevedo.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/jopulafot.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/besovevexirumilapifos.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/96005122599.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/97631977089.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/10467502032.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///vixavofevajusuto.pdfIn PDF document text
    • https://ww170002.linebot.net/upfile/files/20210926201004.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jevafufusimam.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/41797394838.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/xikodimabad.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_off0000b143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB143 10140 bytes
SHA-256: 6de3f4cccc1ef2d6277cec692364ac99fb85520b88e42231b532632e294b1df1
font_01_sfnt_off0000c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16900 bytes
SHA-256: ef72cc44744243a8b98c5ee8d5813ba1396bf4166551b7e6995a6589221a644c

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