Malicious PDF — malware analysis report

Static analysis result for SHA-256 7798a0ef22c18dba…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 08:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d47deb8ef49a62393df88570943b99ff SHA-1: bf9b80978899aec1814cd321a7aededd9fca6af9 SHA-256: 7798a0ef22c18dbab26c4c29e0fe409d659879f833f9c933ee65b40d8853cba8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=android+cannot+connect+to+peap+wifi PDF link annotation
    • http://ideviceplus.be/app/webroot/files/userfiles/files/naxagu.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/juvewoloxanozevo.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/9162006199.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/48304456957.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u8g322cl16odur13t07jjrup9s/76407676122.pdfIn PDF document text
    • http://debten.net/UserFiles/File/wasepodadewizovujosuzej.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/75444312182.pdfIn PDF document text
    • https://slavyansk.biz/userfiles/file/74333570731.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/xofobubawavuxasapo.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/34263631179.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/panenigotokixeruninatene.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/rovobom.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631761630.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/28926012026.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/fewidegugatiwovuriz.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/43539751750.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/fabigirazapapexujubu.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/74749660224.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210923164355_plbcl7.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/66997025150.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/deboxupevewo.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/7339695628.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/16924235027.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/pasixojobik.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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 15032 bytes
SHA-256: ace92cf83c56f026a4064a6560b0d0d0ed8a81a05d0272646187b50ab04b57a8
font_01_sfnt_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10464 bytes
SHA-256: 98f2b556c37fa28ae5df09103f0c3e3d017a3035930bee1965984e8dd9ea9abb