Malicious PDF — malware analysis report

Static analysis result for SHA-256 c193841535a84d21…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 04:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0caada9ee873f94bd9f09f540f388c82 SHA-1: 2db0d0032afc3bb1ff3443947280bf0651729473 SHA-256: c193841535a84d212420fcfa2d7b62c3420b3e1cd84c31c5a33eeec400e8582d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/lixajasaduduxetikugiwudi.pdf In PDF document text
    • https://upaspor.com/resimler/files/segekawavunukul.pdfIn PDF document text
    • http://boldogelet.hu/media/26813398631.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/48672797189.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/kuwonorezuvaxazuvefurami.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/23812855210.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613497de1dbf1---taruj.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/98520249351.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210911132956.pdfIn PDF document text
    • https://scalper.ir/data/files/file/40336877319.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/buwupex.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/nawiwepaxu.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/gojogiwokata.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090122342370554.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/18929004203.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/45002222275.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f50f9212a---3849428754.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/93237807328.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/28915008960.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/64181906158.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-12/4ea20b2e7fd11d7ae029cb1558cd89c7.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/dijunitegatevesoma.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/85618402289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+friends+reunion+free+onlinePDF 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_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 18764 bytes
SHA-256: e35cbcca9d4a87f6e6d81ad000fa891347d9908238d1a39d77cf6db4818f4aca
font_01_sfnt_off000143cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE4 10256 bytes
SHA-256: 42fb71bda7e6c1e6d383d30f83b7e736d6baa8cbcd37d92deb1c9a7e32d2c241

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