Malicious PDF — malware analysis report

Static analysis result for SHA-256 beffe767bfdcaebb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 674916c1e34fec2a4802859390930dcd SHA-1: 90163673fffb2cc4d1fff5316657a6dc3a2d78a5 SHA-256: beffe767bfdcaebb1e9d931d99cabcb6a3f811e71da5dbe0b6cc1b67014236fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of distributing links across many disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abicecream.ru/ckfinder/userfiles/files/74580788222.pdf In PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/3189878151.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090915291573499.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/80954429531.pdfIn PDF document text
    • https://eetravel.net/file/molagux.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zepitezukomumu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/mevomaragosofu.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/taveviriri.pdfIn PDF document text
    • http://teakdeck.pl/files/file/937323653.pdfIn PDF document text
    • https://dom-titan.rs/files/62441312399.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/84959500037.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/48016720480.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/39772097208.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/makeka.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/33650652613.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/laxaruzivukererifip.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/jubuvikofudot.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xegivaxifopotuposepir.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161332e2fd3014---13176190461.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/73108645455.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/44316641623.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/somizenitomok.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/xewuvo.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/92786293413.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/nigima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=calligraphy+free+worksheets+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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10996 bytes
SHA-256: 2d32ca6696c56e53f217eae42f7b1e9f02091d84b832906dcf5d73ebb22f26c9
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 17568 bytes
SHA-256: 2df35dc393e1df985f21d6fb701b356a232d5e336e60ee279b2817d32339a79f
font_02_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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