Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d86045bc3a63c3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 12:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b3c4c6cab263fa499ba2b27318c8c93 SHA-1: be93991aff55ac095bf222f1476b91e002b69266 SHA-256: 92d86045bc3a63c374a310092324fb68d5e6572e4b2c649c4eca4e891cfad03d
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=indian+idol+junior+2015+winner+vaishnav PDF link annotation
    • http://billsky.ee/files/file/83701142658.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e753f1d3b0---17477044457.pdfIn PDF document text
    • https://andhimazhai.com/images/files/95461436703.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/6633732716.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pevenodusefakidoti.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/72021231709.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_083851.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/76021648645.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wadukowuxutipegefolil.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/nijibapomotu.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/nosufoxapujobiluziguritug.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/vazesebidorasekudov.pdfIn PDF document text
    • http://asvpp.fr/pdf/44025211189.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/77949712983.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/5479829977.pdfIn PDF document text
    • http://rem-proekt.com/f/file/42633404007.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/11314002684.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/xeteleta.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/texizupebus.pdfIn PDF document text
    • https://izr.fr/files/jemitemej.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/gelediwilisi.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/76747855887.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 11008 bytes
SHA-256: 60fa95520cbae913bf227f8656c9d993f998c6dd4ed824588a7517488765f82a
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 17944 bytes
SHA-256: 9f5f04cb3e60966acd63c59db6ef3a708717385e3953961a14b16d797c177b7e

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