Malicious PDF — malware analysis report

Static analysis result for SHA-256 385513636987583b…

MALICIOUS

PDF

91.5 KB Created: 2021-09-24 07:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d996d7b6a1c513281d92cb7c1977a60 SHA-1: 4dd5515ac2d419720cceaa18c74f4d78e982ea02 SHA-256: 385513636987583b4e8bc0649887df7200ad108a78b3ecc2a6c716c9d5b5fd3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

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://cructi.ru/uplcv?utm_term=video+lock+screens PDF link annotation
    • http://kor-ra.ru/UserFiles/file/zidufuwetusudiz.pdfIn PDF document text
    • http://leeandrewdavison.com/download/69558845679.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/39229079910.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/94227485727.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/fidifopegaraxajivawe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/8usrh1o8i091gqev14vbm8qgt9/kunumerobiguro.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/90092197681.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/tesijinuzemu.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/totetex.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/12305867396.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jutawimerugaja.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/mefosujifutifosubevafa.pdfIn PDF document text
    • https://mackbeks.com/files/file/95573551880.pdfIn PDF document text
    • http://m2m2design.com/userfiles/94970721848.pdfIn PDF document text
    • http://chongros.com/userData/board/file/telebolixifupexeb.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/julivosisevebojasuz.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/69701988254.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/51478061885.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/98037037157.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219122314245257.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/didaxugefufifekikax.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/11639510993.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/21330367818.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/xibugutuvawufolajuz.pdfIn 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_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 17760 bytes
SHA-256: 6fcddb64186556ba7b644472924023fb75cd2f236125e7245bb31833e1ccf4db
font_01_sfnt_off0001393f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15156 10164 bytes
SHA-256: ab7e857a4ff01a0b3e36d2eba116db31e017087add041110ac6f06871a2768ea

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