Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eb25aafa45bc31…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 11:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1e46e1cfacdafb1f7b4ade5ce8446036 SHA-1: 31e3a588737db5c88abf4c046203f390092aef82 SHA-256: d0eb25aafa45bc311c36874e9dc05f75b5a0486af8f1498ec3ea49e274337e97
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tcsklife.com/filespath/files/20210902092744.pdf In PDF document text
    • http://mylivediamondinventory.com/uploads/files/35425796171.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rituwutifijarovizamekulo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/selosalosatonepeponurat.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/30195236700.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/74855255237.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/35149692270.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/nedirigejureziv.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8eb8b95ca---dezuxuko.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/leponux.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/75359670430.pdfIn PDF document text
    • http://nenorm.com/files/files/gorezixux.pdfIn PDF document text
    • http://abworder.com/uploads/files/91053078007.pdfIn PDF document text
    • http://kd-council.com/upfile/files/51393974958.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/292aaca69b002da590fc1859a5865fc7/nazoxodabesamubibisorise.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/69124372595.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/loduribokusuluwomevunub.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/35109816996.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/56442519240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fruit+ninja+2+iosPDF 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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 21400 bytes
SHA-256: cbea02d28da96b058227bb3a88631e76f69928688eaaa182aa2970601b9ab70e
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 10248 bytes
SHA-256: 380c2d7656eccad76fd9161163ea3d439db21b9a0dbab7577a9985e0a64dc972

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