Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc3d13671221a88…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 15:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a7687fd8b610f4c533c1fe46c99ca6e SHA-1: da55f45a03e80d6e9f9e27a6c6496163819272d5 SHA-256: acc3d13671221a88b4f1330493840486724c323881c312fc5885f8fb343b2e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for distributing phishing content or malware. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=how+to+clean+up+temporary+internet+files PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc1027088---doziden.pdfIn PDF document text
    • http://irths.com/upload_files/files/99779588574.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/26381898686.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/laromud.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/disunite.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/88009205532.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/50354436025.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8205cee3d---19510359640.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64290718748.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/30245206346.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/noxoxarivorirodupesofavut.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/masedigidavitukab.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/gerubibevusagune.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/pinamukenojizokopiwev.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/31354744500.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/tedivifevubatexakirizova.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/66823893378.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0389007001631792601.pdfIn PDF document text
    • http://castel.lu/userfiles/files/jibimolagalilokesesur.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/82563037265.pdfIn PDF document text
    • http://juha.be/_files/file/90183936832.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210915_F42974BB25274A64.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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 10932 bytes
SHA-256: 2d891b67b413ddbe157e06e9c83f07c81a3f64171c9609f72a38fdd9ae6acff0
font_02_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 18340 bytes
SHA-256: 24dd2ec0f9350fa1add149eb47a86dc8d5d8d03168139f51484b7479d7ccced6

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