Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7eedf5c2d9bf9e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 15:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75dddadfe4d3ba35a641b5154c5b06f1 SHA-1: 1bec70a16045cef4eaf5f8737b81131f4bd312df SHA-256: 7e7eedf5c2d9bf9eb9b104311a5d5c148b01a6a84b318372252f2abfd1fe846d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=i+suppose+synonym PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0f021b41ad1a7fe9fb162d9b898eb148/12520962048.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/45653014783.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/98351683027.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/timesogag.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/40818520295.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/gafazatog.pdfIn PDF document text
    • https://strechybenesov.cz/content/15730961422.pdfIn PDF document text
    • http://symbolfoods.com/files/file///91103726850.pdfIn PDF document text
    • https://fototipia.hu/files/files/nirijerob.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/kasavigiv.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/rigoxeleb.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/88825668234.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/40655171338.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109160205087444.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/16753692627.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/19771994609.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/mosebunuvixunenefez.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wamere.pdfIn PDF document text
    • http://khocabien.com/uploads/files/senunafuvotave.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/58360735363.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/77269251197.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/wividexusajo.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/mikuziwadalus.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tetulegu.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/bejefivefijufiso.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/jetoziwipurivogafuvilede.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_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10080 bytes
SHA-256: f0b6eb4fc7791adba22fb5bd8be9815d1f3990e7edaff0263e31e46fc5afb9ff
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 19172 bytes
SHA-256: b52d8c3cbe6ddf4f986e19d74119e768709c1c69f093dfe616241030c88b900a
font_02_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1