Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac47eae85122db20…

MALICIOUS

PDF

77.0 KB Created: 2021-09-29 06:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ccb302eaa3d7bbee058f197e5fa6ff2c SHA-1: 2993f79202957c47eeb48c5533070f3ec8c09f44 SHA-256: ac47eae85122db20e7598fab83687be7d60e8488cab4c3b2fa6e16791367c767
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one flagged as a link farm on disposable hosting, suggests a phishing or content-luring mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are commonly used to deliver malicious payloads or redirect users to fraudulent sites.

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://lyzebrno.cz/userfiles/file/tepekebovizupujup.pdf In PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/zugejatixez.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/zopupame.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/93c1c6985d63a32ae3cdcc13495829f5/39664215566.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jovav.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/vanaboxaduga.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/welivitotapimabaderan.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/simiviwupozakeb.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/39594999640.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/20288019512.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/15169038091.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/31310198904.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/94234695922.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sopawodanijugigosalame.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/selinamuxozoge.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/mujalupirutuwijejaponudin.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/gutokav.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/340110882.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gamida.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/42523744222.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/wofom.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/36261068818.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/75714188078.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/tuwavupubugamexagutatanib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comment+bloquer+un+num%C3%A9ro+sur+samsung+galaxy+j3PDF 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_off0000bdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 11448 bytes
SHA-256: 6d5ba933a41f1614a1c07b784aababfe910ccf2fb7369977abbc4a50e5156a95
font_02_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 19648 bytes
SHA-256: 80e44124c7430b96e07900ba8663d6465c4aef709fc9e3f48abacaaac61639ee