Malicious PDF — malware analysis report

Static analysis result for SHA-256 f058b7062cc43358…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 21:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10ee5004bb3e2aaeec528d60c30db46d SHA-1: 528f4571b9996eae212cf5b44d66090f36dd560c SHA-256: f058b7062cc433581fc5a9c45ee6f1770b313f9923defb9797bae4f00bad8091
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a tactic to distribute malicious content or phish for information. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vxclouds.com/userfiles/file/13114545445.pdf In PDF document text
    • http://solarissoft.com/img/userfiles/files/wawuzemojerabimuxuzivik.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/61260469688.pdfIn PDF document text
    • http://hla.vn/upload/files/begegewasobijibekotixama.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/dabotuwafuteporetigojewer.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/15048193398.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b22de32c---47454111682.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/3440629140.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/60913667418.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/97195689202.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/172165780061366629e753a.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/miwabezilagafudaxagi.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/xareboxikuxixevod.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/75088109123.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36b70f3a0---dewipozenufuvadati.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/rubujepuremekafeko.pdfIn PDF document text
    • https://grouptm2.com/contents/files/83766682078.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/92659272518.pdfIn PDF document text
    • http://vanhacollection.com/images/files/94876652608.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/rusesezugefaxajirivijinov.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tokolisebiriwesekoropamof.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/12887825760.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/64899027859.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/5478811797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+citra+rom+hacksPDF 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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 10540 bytes
SHA-256: 08a8f5ba71e7f4a5a8a32bd0e072cef309ef1bad6508f54a32720beaec96c555
font_02_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 18724 bytes
SHA-256: 11ad4a9d72890f8e71d99a60ee48b3ab1792f38b6a9246c95e08b417b3c506d2