Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3be87fdca55228…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 02:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acf6557ee602468c25a99b4c19b21a8d SHA-1: 134712a5839d1d98323ab7fccae3532ccb9e26be SHA-256: 3e3be87fdca55228f5a4fc29d8a89ef018a7f6ca295df38ee57294638c286263
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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://powerliteaac.com/userfiles/file/64421488456.pdf In PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/82060592743.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/86620728000.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/94444872107.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/94843599070.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/42888555730.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/kefetedajopowo.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/sujipajekotare.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vusuzawejewomuzabaxodatul.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/1921837015.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/76597512387.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/57993562827.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/17156635370.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/sojigamowotarejebeduluw.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613801a3cf6ab---23769564986.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/17941823496.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/92733381092.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/35642227793.pdfIn PDF document text
    • http://fitviewer.de/files/file/51985070179.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/15542413072.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/62774789330.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/78761579670.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/ponakamufodanenapoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=savage+love+mp3+downloadPDF 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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 10676 bytes
SHA-256: a31e6b47aebbaba34a8963ed4280a124a371872e26a0397506dc3cb6bab841f5
font_01_sfnt_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 18176 bytes
SHA-256: 59486a62bb7b5bea7d5504a94595d562c42a04aec0246522e391e8ac6db9f257
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1