Malicious PDF — malware analysis report

Static analysis result for SHA-256 d642ae1da9a601af…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 07:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4bbd6974f583d279f62fae9b5df00dc SHA-1: 9c7ededbe58e446c3a10c9c8bf9cb58d39c3e193 SHA-256: d642ae1da9a601af1dab5725827fb079ebdf66cc3c14270f9d8e0236bae677cb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document uses urgency and a download button lure to trick users. The presence of numerous embedded URLs, many pointing to suspicious domains, further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://conrays.ru/f/data/78880360036.pdf In PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/fulakor.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614009770d12b---zekowikisuxezetux.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/46543035204.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/kexek.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/sijuxukuzafikuxewubi.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/81691697125.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/sipifelonerij.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/setotidipokowel.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/vixowanox.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/34130553883.pdfIn PDF document text
    • http://c-amc.com/upload/files/jideveto.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/xufosir.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/29456060741.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8642ee204---vixupufuwoxajitowegareju.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/10165854909.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tinasamamikiwovav.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/95796081648.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/73627313317.pdfIn PDF document text
    • http://hrudolf.com/userfiles/71885032822.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/17563749345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dil+se+full+moviePDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10080 bytes
SHA-256: 466a9ecb92d6f143404e34536b0bc0508d8c0fec616b3a7d1cfad0f0846ed1b3
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 17620 bytes
SHA-256: 68a55943e73adcf739d7305a341e9b3f676899c3d93fc8dc359925449d53dd57