Malicious PDF — malware analysis report

Static analysis result for SHA-256 088c710681c40fef…

MALICIOUS

PDF

90.6 KB Created: 2021-09-20 00:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 573434a52941d67c39fd258f3de66301 SHA-1: d1377f1f7a9b1a695e13b6306a8456d305271ce7 SHA-256: 088c710681c40fef9583331fa4e6bb09c5304bdb7a4cbdb2a474da1b0c512d40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('chcial.ru') that appears to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, identifying the PDF as a non-clustered link farm on disposable hosting. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=t+shirt+design+studio+premium+apk PDF link annotation
    • http://pampa.be/uploads/userfiles/files/zobijolijegufeva.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614430c5ba6f7---niporezovamakuperemo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/98562076651.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/31933237920.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/84014474436.pdfIn PDF document text
    • http://jump360.co/upload/files/20210915143739.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/lawodakekasutipezegogi.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/dokazilipozodorekuvuti.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/54850901651.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/zuzizatuxoj.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jajuvuxibadugodebizuf.pdfIn PDF document text
    • https://pecsikult.hu/files/file/18033514910.pdfIn PDF document text
    • https://membermimpi.com/contents/files/64263675108.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/varuleguzefotetiwasexot.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f33a1d63c---53061929744.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/silaxak.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/14042202898.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///rewezazadagina.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/6725501384.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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 20144 bytes
SHA-256: 481f4d389c1f129b3d02c080c35d751bd8879b89c32b17f8178424da3fcc5587
font_01_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10948 bytes
SHA-256: a1fae8ae5aa6db3ea21e5d55dac62341dc87927ea19f1a862e97690e2a400c18
font_02_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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