Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96a54ec0612c737…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 04:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38390d70bd8fe0162798f722399cd4f4 SHA-1: e864559cf556a5650933f633e546b6d87c2e1974 SHA-256: b96a54ec0612c737db0e51e4cba18b5a150112817848a03a9062ac9e3bfcd8bb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to host multiple malicious files or redirect to phishing sites. While no scripts were explicitly extracted, the nature of the URLs and the ML detection suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ipost.mn/ckfinder/userfiles/files/xunowirug.pdf In PDF document text
    • http://anael.fr/fckeditor/userfiles/file/vukodokuwa.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/piriwilizisos.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/sakuwojuriwex.pdfPDF link annotation
    • http://phantasos.org/userfiles/file/91166259851.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613552449b8e6---51378676927.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/85674622415.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/wazegeguxuxasubukopo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161412c1b1a8e1---12179784122.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109061707496105.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/38419077934.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/kibor.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/mugodofozudu.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/tifowavixamidujobuga.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wefotujaziboru.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/69000310582.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jaxuzolaxa.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/nidetaxozugaluwax.pdfIn PDF document text
    • https://resicolor.com/upload/files/nepiruwilirenuxukunodel.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/otucmsu8d7klitrl1sk1spth69/78609271600.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/panepulaxa.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/watilunopanusopomenoxe.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/22948592904.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/wotepale.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rurizariluze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=finding+the+equation+of+a+quadratic+function+given+its+zerosPDF 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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 11060 bytes
SHA-256: a6f3b50ffb7322c94e4ba8a58e4cd56be5ea0b9e5f53bda68cfc9f72b696ae15
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 18132 bytes
SHA-256: 5772a9487153cb6ea87a791f4ffe530949d5b9344ad268d9e75646ed3c6f47fd
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1