Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62e008df762492b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 14:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1dd3e8b29b5f28e644ad12cd4be9c92a SHA-1: 9068b42978b3fc0be36749e589c4109cffde4c82 SHA-256: e62e008df762492b8a428b85d3fa9b8abf29c306ad989207950be34d4717775b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it contains numerous external URIs and is structured as a link farm on disposable hosting, with a primary URL suggesting a fake download for 'pubg mobile download'. This indicates a phishing attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://synerhu.ru/uplcv?utm_term=pubg+mobile+download+100mb PDF link annotation
    • http://sbairs.com/datas/files/tometinufojosivuzekiw.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/2640542431.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zomutotokit.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/74613745069.pdfIn PDF document text
    • https://energooptima.hu/upload/File/88815167527.pdfIn PDF document text
    • https://thehouseproduction.net/file/zaguwovuzojigidananefo.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/5399445989.pdfIn PDF document text
    • https://12shio3.com/contents/files/48356403646.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/75833250136.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/kabetiruf.pdfIn PDF document text
    • https://moolans.com/uploads/files/985279650.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/95380437120.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136bef362917---76100590575.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/vimojiduzupogabalexura.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/55017504794.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/38906636420.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/96970905038.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/72833802596.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/39676372131.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/depum.pdfIn PDF document text
    • http://apicn.net/upload/files/zexipoboxabixeboxasefeled.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/nafoloweguvi.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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 19384 bytes
SHA-256: 3981a139afb31e9966530a7055677941e0e806e46d4a8c216b6c73b608991b04
font_01_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 10724 bytes
SHA-256: 477d6b39e3838eaf81110c7ead37ba1b0fa66aa0624af92ecde4cfa31993c332
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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