Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f00c04552fc491…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 19:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0274312fbbe894037396485357afcaa4 SHA-1: eeafc91ff3cfb0b65eabfd5d0458741169b3f910 SHA-256: 64f00c04552fc491be9c31649153db9afbd26239754c508403156098e3aeae72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tsolisp.com/files/file/83045412161.pdf In PDF document text
    • http://domgr11.ru/uploads/files/57014628192.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/3317944628.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/3584253187.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/lofejisavedije.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sekawemupomumumemisapok.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/wosewuselutizikoxuxadeve.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/pifedonupipulumoze.pdfIn PDF document text
    • http://rem-proekt.com/f/file/zejodukigafebira.pdfIn PDF document text
    • https://partetesal.ir/data/file/widiwerutavomek.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/ludij.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/witepizirizadurizud.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/tunatizivebipa.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/62982764635.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/56092263562.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/bafebafovaruvux.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/retube.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/folubarogom.pdfIn PDF document text
    • http://hzqzg.com/d/files/sopumamafobedadijez.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6d51af35f5d66c4567d7134c97a64f4a/mubegujiridolu.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/33853595263.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/26354644834.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/degezibelukopadojijuv.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/magonakaro.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/91607165307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stranger+things+scriptPDF 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_off0000b188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB188 17096 bytes
SHA-256: 183c13cd688cf9b880e7fc1852a124bdb9f3e0a7518479f9a75c31f4bcabb769
font_01_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10564 bytes
SHA-256: 383a7c976a37d36bb24d0f5604bf49d2aaa135e763778cd446cca997fc6794b0

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