Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1282838cfde862…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 09:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 472db52bc6b90c7a078549d657e776b9 SHA-1: 4cdc0472bfb00a9ed0ba80a1451b848644c6a1ea SHA-256: 3f1282838cfde86225e183cc9c832cf02da305aead772cb1d8f746a2490b7e7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pistant.ru/uplcv?utm_term=free+best+call+recorder+for+android PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac0806b95---57574117763.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///kubuvofekubi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/dujanusabixabaramem.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wuzudij.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/79921124218.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/popepikako.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/texapipevenonerobanaxijil.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bokof.pdfIn PDF document text
    • http://rococosofa.com/files/files/92880164372.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/45030592150.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/34915387244.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/16784236662.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/59657737712.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/74209775647.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/82510004884.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/36415495511.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909185145_gpbdj6.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/muragakobimorozupotozov.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/88083367996.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/15131949059.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/limadena.pdfIn PDF document text
    • http://yanartextil.com/firma/files/31476108765.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/48797498276.pdfIn PDF document text
    • 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 10588 bytes
SHA-256: fa485617571d737c6ff243ac23558d90e29f8272e6c8dc8f678e00b40b1ebb6c
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 18352 bytes
SHA-256: 351908c74155477494bde2d6404c1ca831b8ebb14863c336d45d13ee3489d3a9
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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