Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4f08e170058e9c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-23 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41d9ef8eb4db588a235694432320a5aa SHA-1: 365b00f844874e7c4fc6c92aa1471b462e37a5b4 SHA-256: ff4f08e170058e9c1401bfbf75a0f251a430cb4e65a74e2fff5329d5e853d553
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malware or phish for credentials. The primary lure appears to be related to downloading software, as indicated by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=grand+theft+auto+san+andreas+full+apk PDF link annotation
    • http://metall-press.ru/files/vosoligasox.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/gri7a10fbfih3dq34laucelrtq/7444167789.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/17679921361.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/35300254739.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/3691235974.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/rexelepabope.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/93073629027.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/9862549324.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/77512865218.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca4786e8ce---pekosiridevozibefata.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/ragogovovolive.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/degenerag.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/9819444244.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/52841760331.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/071523195370.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/35300175656.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/91885036083.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/78208316845.pdfIn PDF document text
    • http://calisnt.com/uploads/files/74504945819.pdfIn PDF document text
    • https://uangraja.com/contents/files/13481258752.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/fuzelozulu.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/pazawalunegojulabege.pdfIn PDF document text
    • https://avela.md/userfiles/file/53190081726.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/vakuditukim.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/pukugusadoviberimopekip.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_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 10732 bytes
SHA-256: b52420d836e77961bb939d6e81d5bb81753788249d0dc38aeeda209734d1054f
font_01_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 17408 bytes
SHA-256: 18d8b1117d67d7f2dd91d2b37e391973faa33e3eace3d3f6417b51fa1748e525
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1