Malicious PDF — malware analysis report

Static analysis result for SHA-256 5714f606607ec1e2…

MALICIOUS

PDF

90.6 KB Created: 2021-09-14 09:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a359edd36f1d03196880214e44b9cad0 SHA-1: 14b9f589e79116bf96dff2efa15947604b34f473 SHA-256: 5714f606607ec1e2c1705dafcacc919d816264801bf128959f9f8b8112464917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external PDF files hosted on various domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://hangquangauto.com/files/87699373224.pdf In PDF document text
    • http://giaexploring.it/userfiles/files/85286457879.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/kamewidepin.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/mudimumafididuse.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/xagal.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/ledatuz.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/97562643194.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/foruzidotitudurufabiluzi.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/relijaj.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/83228693739.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/luribusesizisaseden.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jajabololojasokuridanokag.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/29803376289.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/joxuwipefurikapojokivafa.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xoxam.pdfIn PDF document text
    • http://1carl.com/userfiles/file/jukelo.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/96646440178.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/69071252134.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/kuzuretelu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/bigupuvuvebavivewega.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/ladoxeje.pdfIn PDF document text
    • https://mytopics.it/uploads/file/buzinoxumos.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/47341775360.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/neleg.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/81281523659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+n3ds+romPDF 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_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 19508 bytes
SHA-256: 2fe6a807711b0e083663f975a0edc110abca6a8f84a5fab515ae2a0f80231fbb
font_01_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001440f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440F 10276 bytes
SHA-256: bffaf1a13120dcd278a7e9446192ca40bf8ad17eeeb225cde67b3cffb2950090