Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fc65af505d017c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 19:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f0ca312450455fd9ed244825a8d288f SHA-1: a9f2d3ad4e435d13848ceac49976e5f0e137ad28 SHA-256: 01fc65af505d017c07dda0e2613e931689be6060ef6f61335c9dfa9ed17a347c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one that explicitly mentions 'docx reader app for android', suggests a lure to a malicious site. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=docx+reader+app+for+android PDF link annotation
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/saxegaj.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/wilegusaragidaxomalepuz.pdfIn PDF document text
    • http://szpk.hu/_user/file/ralukexuz.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/95008680958.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/48738437914.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/27104712539.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/51814598836.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/98627546622.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vudamapemuwezadozunogi.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/15252560674.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/ketexuxuzuz.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/zupuwatir.pdfIn PDF document text
    • https://iwistw.com/upload/files/55081627542.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/92518598344.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/29317445085.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zibom.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/batisati.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/91c1e66aefbb0669093f87ee6c047b6f/guwawiraxikaweg.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/nakaxidagepusofopugezomu.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/padabakoxiwutuka.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000aee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 16868 bytes
SHA-256: 0ab37b7e086df3ab44c7276d9dd884584f08c7368e237d7f0331daf58d056fd1
font_02_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10404 bytes
SHA-256: e1682ad8d0963a171664c7237617949367153a2979e36ce22d16ecfb07037834

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