Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d35cb4dd50790d3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 23:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c718cbb9b97520a17792d4387a5bb0c SHA-1: d0d70dd28ebe9d441cadde324e0c96c8a532a80e SHA-256: 0d35cb4dd50790d399e7f96383b7d9124117a99643cf9fc39a9acd0148269c68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to contain metadata from wkhtmltopdf, but no direct instructions or lures are readable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cardolf.ro/files/80335508525.pdf In PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210908180854104.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/ripasigadukava.pdfIn PDF document text
    • http://julianina.dk/upload/file/8658533622.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457ca642145---31867465539.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/95883162390.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143951fa3bf2---newuzutesaxapudupemetij.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/14718792981.pdfIn PDF document text
    • https://istanajp.com/contents/files/kejipimenikaruparoxix.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/23700654518.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/wogutamijabogopi.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/tinovepaduvamavunifabeso.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/gapijuwunuz.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/rikolujimaxowinexeger.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/guzafabexol.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/24835428828.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/lowulomunik.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/zumubotupubebitarosaz.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/wiraxulajuj.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/gijinixaronebakofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hide+videos+on+android+without+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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 17332 bytes
SHA-256: bde7c6c8035a97d5d76304ba7f47e4e73df7c61cd1a047b611c23ee4be13a0b8
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 10684 bytes
SHA-256: a9da1403dadb2022e116fe87c42c40bc72f1d23fd0b64c8654423e26f89c3a95
font_02_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.