Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e8fc9a94b29426…

MALICIOUS

PDF

76.0 KB Created: 2021-09-26 20:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e148aa1c6381f927d1ff9e2ac10ad04c SHA-1: 6f96644d0d182797547f5ed2956313739ca15500 SHA-256: b5e8fc9a94b29426583caf1abec79d9a7cf57441243ada37a972fbfe3938cbd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://camberwelltaxi.com/survey/userfiles/files/40647601486.pdf In PDF document text
    • http://bookblog.kr/data/file/files/siwoxulekinesoje.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/30597284280.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/41838561953.pdfIn PDF document text
    • http://sb-78.ru/files/file/88594023191.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/40549778318.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/rekigogojukesuzegigafag.pdfIn PDF document text
    • http://e-district.org/userfiles/file/xexenodogajuju.pdfIn PDF document text
    • https://lasanisports.com/files/fadoki.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gidebivimukupawo.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210927_6B6AF9765F58CE55.pdfIn PDF document text
    • http://tulga.ru/editor/files/xanonam.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zesifawibamawi.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210916095803.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/zonadaxoxopekopire.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/xepuxeretetivezagemo.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/2451191812.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1fa1aee9---mukusizanifubeb.pdfIn PDF document text
    • https://goodline.by/userfiles/file/71277448162.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/98919525253.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210905/files/20210905092014.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/41959198667.pdfIn PDF document text
    • http://zl369.net/userfiles/file/pofabok.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/besudekefeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=movie+subs+malayPDF 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_off0000bf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF03 20244 bytes
SHA-256: 3f3691747b9f3bcf3fc353fe40773fa157f5cf83481c922df922eb1332d5323e
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 10380 bytes
SHA-256: fe7a75f400fe105585f54754c482915dcad2de151dceb2135520b79f5af8365e

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