Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe7cbdec1991ef9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 20:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c04bead53d7e5844983a49f720e99af SHA-1: ae3a82360be76a4c2f2ce9503b42e7d6b67cf21a SHA-256: 7fe7cbdec1991ef98c2e0342e633689ddd81347b738a1d8a828852dae2e42c31
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 heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://urjabatteries.in/userfiles/file/76806960371.pdf In PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/pixutipuxupezumazalewu.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/20669251240.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/pimomusegapepumozetoz.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/39143841591.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/rigukixopa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d03c1b1a9d740ea5b36b1374a10151fb/56981586032.pdfIn PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/pofoji.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/zopipuxegojo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bfab7f54c52e340821b7bafa367bcdca/40640661045.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/11789017755.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210914170728.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/povizodidagulovuxil.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/wemipofufenunigubojex.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/42352021080.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/lasopesaniwubogususejawuk.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/6819909523.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gurubuvoxaxi.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/4209098228.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/vovaniregabekagagif.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/62892433548.pdfIn PDF document text
    • https://gdaniec.com/upload/files/jazafasudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=spiderman+games+for+ppssppPDF 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_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 17336 bytes
SHA-256: 92d2fdf8714c733c9eb1a59cc030d7ed980d2153b189667fe8e0357b8620004c
font_02_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 10772 bytes
SHA-256: 9a8c9be861a88304a85bbf3a9486c295babbbb4e522ab6830ef4e325db5d5477