Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02bdb76a1789e5b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 07:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e8ec258778c79d8484fcb1a7fb17454 SHA-1: ff7537ccf094fa746f051999ce5bd095719cefab SHA-256: b02bdb76a1789e5b7715de823ff1fa5caaaf5211ebeaf45142197c6583e2de0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=anandamela+pujabarshiki+2012+pdf+free+download PDF link annotation
    • https://pixel.bg/img/file/98730801408.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/jufexavaseririd.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/79271107990.pdfIn PDF document text
    • http://hnspkjx.com/d/files/novobi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/novugexabemutare.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gijobejupa.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/30877687773.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/fefivokokowogok.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/femobojewabeja.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/xawonidonuvip.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/netejafivovumo.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/91127590179.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141895f05dce---10884049791.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060713228981.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/23746270971.pdfIn PDF document text
    • http://seamacros.com/upload/file/dowudodekotadiwunuwipaj.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/52762218490.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/10390268356.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/44501300217.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/vomatewewemilijetonogi.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/64501702742.pdfIn PDF document text
    • https://ismart99.net/upload/files/41578685007.pdfIn PDF document text
    • https://laser123.com/geektic/files/tosibasifajigidizixisu.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/furimuzebijanevoral.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/37608567385.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_off0000b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B7 17256 bytes
SHA-256: 2ac9e1d595b6d04c16bced93206b9b2373f1421c3be096e2429ceb6bf6761116
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 11488 bytes
SHA-256: 5f573033d14ece6bdc8effd2ded2576dc55737d76ed2105221e6f156fc97c001

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