Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd29ab0d27f90e3…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 14:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fcbbe0b7c1629dbca3a97f4176098651 SHA-1: c96c691a6ef0294037405d540e2e843156315513 SHA-256: 2dd29ab0d27f90e301281f38553d0217ceb1a1fb680dfa68fa7b0ad45204316c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous potentially malicious domains. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for exploitation or redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://xsteelstock.com/d/files/fenunisurijidore.pdf In PDF document text
    • http://parbatsamajjapan.com/img/files/files/23346150842.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/49147253449.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1631568906403.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/85666704257.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/guverugil.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/fevebawalulilazu.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/88163130484.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/74949710932.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/90629245894.pdfIn PDF document text
    • http://www.depomatrial.com/file/41451538904.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nekuxawasosul.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/bekiziwoxebozefudutaxik.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/50612046567.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/jumobamibufi.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b9280204---rokuzafubeluxowoj.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/58524694749.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/66911154796.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/puminavaxafukafokegilu.pdfIn PDF document text
    • http://www.bash.cl/media/file/28963710450.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/lejuririvezogofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+mp3+player+appPDF 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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 17652 bytes
SHA-256: d708a43045fb9267ea467a34b97f3766964aa5abd0adc09e3ccf27d338db582e
font_01_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10544 bytes
SHA-256: 30ce38d9b8739f2c0b8e8147d47d40616601f1706198d216d5b7171ff3c323cc
font_02_sfnt_off00013a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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