Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe5ab4ab89f902…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 17:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9ea07c2dcf38e3b59861e4851349853 SHA-1: 5766ac75f3ba801a57b170f7cda10850bf4e04d7 SHA-256: 81fe5ab4ab89f902ea9390c02ff64cbb0c9b97ef2e43ba15acab0bb2e4de83c2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many of which point to PDF files, suggesting a lure for downloading software or further malicious content. The presence of 'utm_term=download truck simulator usa mod apk' in one URL indicates a potential lure for pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gesema.com/UserFiles/file/detujezividojegaxidajoro.pdf In PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/96686357339.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/gebavevedisenevudani.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/59766806414.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kimamasenararib.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/kigurag.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nuwawuvusowafe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138925de2530---femewufevara.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901065510273290.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_4A358EBBE0FDD7E3.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/79459230860.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/nobenosegudi.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/xuvuturesepikenunelo.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xutazamixej.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/dinosutakiraporetawugeje.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/21258431242.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/97573672519.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/misiputiw.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/94921145538.pdfIn PDF document text
    • https://matratva.in/userfiles/file/66151654096.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c1068fe7998cce43165dc121987480ef/81379514840.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bakofapasibowofup.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/42470672796.pdfIn PDF document text
    • https://aneri12.eu/res/file/18158981814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+truck+simulator+usa+mod+apkPDF 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_off0000c156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC156 17328 bytes
SHA-256: 51fa2d83807da0fa5b47e77d09844231b538b6a29d1c2ee3e0aa2acb532f319c
font_01_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 10824 bytes
SHA-256: 2317924457fa15ac678c10674d6f1f498965f14023d752a76dd3721591534a9d
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1