Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a30ad079539b0d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 02:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02e08d75b9d4d55b0bcdbd13c5c932f0 SHA-1: 2350d6db7cc44490c6838c0160a2c249e96108e2 SHA-256: 87a30ad079539b0d54d3887448b04fe7dd90da075a6d07d4611fd62913dad7c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external PDF files hosted on distinct domains, characteristic of a link farm designed to obscure the ultimate destination or distribute multiple malicious payloads. The presence of 'utm_term_redirector=True' and the 'brawl stars apk mod' search term in one URL suggests a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://artepcb.com/upload/files/zawoganajasovojodu.pdf In PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/92195233696.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/fisarumuvexi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613577d161ee7---zopodopisejexigukun.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sosikowiwikewujoveduwatok.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/87005942664.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/mobidomowatige.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/56103083913.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/biviwopeguvasen.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vevinatujawexit.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/advlp5t99461hvitd5nt26plvd/fosarines.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/luvirozagakajiwunotud.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muxawodeletu.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tunularitawefujosi.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/biluraweg.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/51935756022.pdfIn PDF document text
    • https://plasy.com/uploads/file/30496598625.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zekagogigiponidodijelog.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/25827393019.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/8854909648.pdfIn PDF document text
    • https://aspirans.com/files/file/wupevewaxiguj.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/16542266377.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/zopodaroguvezurinatajo.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zorozovor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=brawl+stars+apk+modPDF 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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 17168 bytes
SHA-256: 84a9c34ef0d89b4620436bd663b997631b4034ef850d2baaf8f1378f2b3eecfc
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 10456 bytes
SHA-256: 6cca3e7bcb725fde9e0c145c7ca04f1d7a83eede1fcef1f2c2afaa298c8652c1