Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d2964640527c13…

MALICIOUS

PDF

91.6 KB Created: 2021-09-11 11:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b613404503deb7f194ef7e82a9328949 SHA-1: 02e322dc29c28bce314e58516d44cf138cba9531 SHA-256: f9d2964640527c138730c37f837ca4e830dbb792c6eee82ba08ee25892ad142c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document likely acts as a redirector to multiple external sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yifff.se/userfiles/file/12363995274.pdf In PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/44485963138.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/wesukudunibovefajufovas.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/76085534518.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/raruraxemogetulomedufig.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/76781025507.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210906/file/16309406535989.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/givafumaxizilebugijurej.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82963989313.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/gidazifukaroridusoxi.pdfIn PDF document text
    • https://eetravel.net/file/23611820391.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/lizewigaremobubanawejidaf.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/39109554946.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210902180909.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/24821502367.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96aca4eb5---55570809638.pdfIn PDF document text
    • http://highlander-inn.com/assets/userfiles/files/zajoxokewasomaritujad.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/55432312492.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/42786450062.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/40279699080.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906053517275018.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/29857234169.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/ginejogozajuguwozujar.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/33739264989.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/rukexadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mighty+quest+hack+iosPDF 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_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 10704 bytes
SHA-256: d2d5e88bcd3acc99f38a93535279c9da4460148ed1870d78f6c113630d82b903
font_02_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 19052 bytes
SHA-256: 9eb9663e02e4c933cc349d7cf893af85476a6ffad62052b360a964aa86311b52