Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8e7ef5527f35c7…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 01:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e6e24b5cb4f527989dc1927ffa030e4 SHA-1: 2c9f53f89fc7629e8d12fc8a1d41b636f303e510 SHA-256: 6c8e7ef5527f35c76514f3c2ad41a8e6e4123c66bd99ad32f3eb68e43f7550e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=friv+2+new+games PDF link annotation
    • http://j-club.eu/userfiles/file/37490588814.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/jeter.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/29951185452.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/vodimugimese.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/sojoxajoluwivumawiturok.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/38630111208.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/xomubojubi.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/5050741563.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/50041285363.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/dutobujezoxoj.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/lanezotupifalarido.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/bozirovulupixumudelatunos.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wimetuluxedujoteti.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/65684674314.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/61784941312.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/begejixunemazabamebawaka.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d736b8a991---11667452397.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/nakem.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916050731523131.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/52454374308.pdfIn PDF document text
    • https://o-dance.com/upload/files/17426539727.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/85193850656.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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 17188 bytes
SHA-256: 1446532d60c29b32bee90981be5fe0f81bf1d4234e7e2778c29e5ff8b2c47cb7
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10436 bytes
SHA-256: 413d1b3055c51e6f13a4dc751a80a1313b9e2a13df4815bc3e951ca88414ed40

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