Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fad17a1ff260c73…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 19:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7eb511d7473ead7ac0bfbbfb2439a142 SHA-1: f782ca52495d5bea547dfca894432d6cfc07d775 SHA-256: 7fad17a1ff260c73d2f4d8656d08c5130cbcef8dbb299fc7b54923ce002c3928
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true content, but the overall structure and heuristic firings point towards a malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://immodraft.nrw/images/architekten_agentur_images_/file/wonez.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2a61f4a5---34135389050.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/84344151512.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/4501891303.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/tupag.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/63294077776.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/5404791377.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/56932377461.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219211535209210.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/foxogerenenejup.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8plg05p196lh9eccoel6cvemb5/givitesabijab.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/gapaxususukofowonejaw.pdfIn PDF document text
    • https://norservis.com/files/files/murobisuwux.pdfIn PDF document text
    • http://ingore.cn/upload/files/39665598656.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/52235636461.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xodefada.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/kobedusajedinux.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/68822416076.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/18797459259.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/55015080924.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/baxiditubajivajavatut.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/44096693230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+soul+silver+action+replay+celebi+event+codePDF 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_off0000aea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 13868 bytes
SHA-256: 139e7e8e86bc15e2883810ea35ad48604456be2110e8755f49036dfc5a887d79
font_01_sfnt_off0000d12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 11188 bytes
SHA-256: bb0f46a12a9d9995d1e908e4b18dc79cdebcffe80c1d8b7c4a53968a002536d7
font_02_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1