Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4b04f54ed5633f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 20:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24d9bb678c33a04d0cf68744c7a3b820 SHA-1: c048484ffd58e3bf1272685082c9be1fe7aa280f SHA-256: 6c4b04f54ed5633f83a94f45f1f2513117409413398d51f9afbbdc81a9aedc93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as downloadable PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, low-reputation hosts to obscure malicious activity. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://peter-scherer.de/userfiles/file/supalemanibule.pdf In PDF document text
    • http://cascad-trans.ru/files/nawewedunuxelatimiwubufo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb678c11c---votofusop.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/66154598464.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/nimaxisixonibijevimimuwe.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/74820834652.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/80379248040.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/22853924046.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/fazifuvafifojuzosib.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f6086815d04e6e75071807e53c67f920/siwoz.pdfIn PDF document text
    • https://jin-ji.com/upload/files/93000610032.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/65638622044.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/dekuburowajivaloza.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/noporurututojefot.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/82776275662.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73389952565.pdfIn PDF document text
    • https://parfumzone.ro/files/file/34276848780.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/tetodanuveni.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/dekigujav.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/68024693898.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/rerav.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jurunelulanufedagovo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/jefedima.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/werufejuduvuniwolibujeki.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42002767149.pdfIn PDF document text
    • http://bjjiffy.com/upload/20432403274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=house+that+jack+built+streamingPDF 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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 11132 bytes
SHA-256: 7514e9ebee54121123914dc58c165aaee8f052bae38fb7b42e180b2a1e8d19d1
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 18940 bytes
SHA-256: c19878aaf1e3506a0c1add8b11b54ebfb63727376fcfd0914f4830b198408250
font_02_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1