Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f0f8d80b4b7b7a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 08:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71a13e92cb8b426e912c2c5dd1daf0eb SHA-1: 25a87903bdb86def37f35c16de6870a012e041dd SHA-256: 11f0f8d80b4b7b7a79a44f9f498e398ed8879be9c9dcef51a5f70ee43a98287c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vinmexindia.com/uploads/27165078461.pdf In PDF document text
    • http://yibetter.com/data/files/tugilonujarotupudejoxip.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/81117136379.pdfIn PDF document text
    • https://soechi.net/userfiles/file/sixejaxuk.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/74800377993.pdfIn PDF document text
    • https://egca.fr/userfiles/file/20087178277.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210907150220.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/07/84202514446.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/56063095719.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/semunorutadaromonowa.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6bf10413e9aed2bc244f4298dba5c144/pewizodosowikamige.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/68955030533.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911135508329052137.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/disuterugudofusel.pdfIn PDF document text
    • http://tabletopad.com/images/file/vumoxavivegesomisu.pdfIn PDF document text
    • https://oasis-travel.ro/files/14021756610.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/labalalivodutegog.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912213556110197.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/75453804320.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/rutizemililijapo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/54578682518.pdfIn PDF document text
    • http://wmsone.com/eimages/file/8408216662.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/vomemomubagetadidimegurol.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/dawariluno.pdfIn PDF document text
    • http://fitviewer.de/files/file/motefabobuluxifugad.pdfIn PDF document text
    • https://renewone.de/files/mikudib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=flick+shoot+proPDF 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_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 10140 bytes
SHA-256: 4822864e63856572816d8ae5385952878a9a50ed9cca98cc105949ce8529ef55
font_02_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 17132 bytes
SHA-256: 761175bf407560afc3c48457f9a090b16b870f21d377a330ea73bf6f1a528154