Malicious PDF — malware analysis report

Static analysis result for SHA-256 794c95f94063339d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 10:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 53cee5ce6c82f0a92e1cd895b408c7bd SHA-1: 068b5c96fc09e9470b040587cecf1c013daf6593 SHA-256: 794c95f94063339d708e8e3cb0f5a4e342235607812e11ab369a4d64321e7b51
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a URL containing 'utm_term=new+messenger+2020+apk', suggesting a lure for a fake application download. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external links and the nature of the detected threat point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=new+messenger+2020+apk PDF link annotation
    • https://pachetedeturism.ro/images/files/80803085625.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/vozobojilunuzager.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/karokivevepaguzofowuwi.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/12623300052.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/97970189300.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/sowunuwejijowibizofalu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/gomogipimumaku.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/37068680373.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94777327991.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/vetevageverozexiwafowisep.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/gesaponegabasoxevuk.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/18308378571.pdfIn PDF document text
    • http://househouse.it/userfiles/files/konewol.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/29931698496.pdfIn PDF document text
    • http://sin-hua.org/userfiles/regijimijirilitafawesed.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/87479328577.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/67202783712.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/50087983341.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/bixutevemimabinixilaxutom.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 17500 bytes
SHA-256: b3ada87f9d020896f66e9b488913f0c56ed3a4eb6c02aeb6750d480392a424ca
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 10636 bytes
SHA-256: 2d2bdb7cea2aedb1e499a31b8cf138a40c6a404aaf89cac3baf37242942ceeb4
font_02_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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