Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a3bcc6b5a9343…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f38eb8a1529ac43b7b3642a9639b204b SHA-1: b03be963fb925ac886a648017d82683841622e09 SHA-256: 891a3bcc6b5a934300c1e9e2874121ee2fc50a35ce12a147e56ecf1b46c11c90
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URLs, with one specifically pointing to a potential phishing site related to game hacks. The document's structure suggests it's designed to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=hack+game+last+day+on+earth+survival+ios PDF link annotation
    • http://dlastudenta.org/Upload/file/89668309530.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f321c506bd---kenenigivixisadaved.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/terodifijodaduxuwo.pdfIn PDF document text
    • https://polaria.cz/images/file/gimin.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/96698035364.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/54949335027.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kusetaxodifakibu.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/raleg.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/selasuduvoseluxufuvovimu.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/86927662431.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/30238997623.pdfIn PDF document text
    • https://people11people.gr/uploads/File/fozoparesasuxojew.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/83450324763.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109200411071791.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/95499798556.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///vunakizofuwibaxejudu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/jotuxenadufomelugonaro.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16151cbaa6ec6d---jexinidemibononisiw.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/zorapuw.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/80386908452.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/71492936607.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/47124009951.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/bijexatazuzilotaruvo.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_off0000ade1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 11180 bytes
SHA-256: b2a35931f9d19c5ad29598d10df5d1b1558182d677f071486477e8bd9ac4355b
font_01_sfnt_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 13828 bytes
SHA-256: fb9fcfdf99813c353b4bc40b95f1172f5297762df66e945ca6aea27f106d5888
font_02_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1