Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef61467e4386926…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 23:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41e73c269af7b470e127fa69f162407c SHA-1: b0a7d24c04752d2990201feb0254143c2c872c47 SHA-256: bef61467e4386926d6304125ce96373d6009fab4e9b618a4b8fb03513e15fcfe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and numerous external URIs. The presence of embedded JavaScript (T1059.007) strongly suggests an attempt to execute malicious code or redirect the user. The high number of external links, many on disposable hosting, points towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+add+a+shape+to+a+pdf PDF link annotation
    • https://maintogelonline2.bet/contents/files/79049545534.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/87880055401.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/sisomuvimupim.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23609359635.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/wazejemap.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/20479957943.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/94426155037.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210926071931.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/gudaf.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/mavezef.pdfIn PDF document text
    • https://panama4d.com/contents/files/tefuji.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pedodutodimivukosi.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/14551496126.pdfIn PDF document text
    • http://esangsok.com/upfile/files/31308826392.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/46205162984.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/54104079616.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/nafetakuxavovuxuvuwogat.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/94115836733.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/dubugelorozelepeju.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/87662820426.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_off0000a963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA963 10328 bytes
SHA-256: 837803acd10199d68d80459c23d261f77221f949e6d881e9be5e6b4c8890533c
font_01_sfnt_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 15188 bytes
SHA-256: 276e529daaa3841526c99706e80cdfaf9ad4edc41ff8f229215e1991ed5e3376
font_02_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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