Malicious PDF — malware analysis report

Static analysis result for SHA-256 034211aa8557e465…

MALICIOUS

PDF

76.4 KB Created: 2021-10-07 12:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c113ed1a2752efde0d7682fdb7a01a3 SHA-1: 0fd0b3226afaf0300d5982212c6c811a84eb6461 SHA-256: 034211aa8557e46579f46f7799fa9c907ca99628e2b07a709b1082acb21aa312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure malicious links within a large number of seemingly unrelated URLs. No scripts were extracted, but the overall structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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.
  • 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://presstone.hu/userfiles/file/galokitose.pdf In PDF document text
    • https://manuscripthandler.com/userfiles/file/70914305818.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/33184914116.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/97003229236.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/zifubivoponagakuwotujone.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/70653639143.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/62552889728.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210919030217.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ziruxuxelikibu.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/vifir.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/36521847618.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/55847862505.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kezos.pdfIn PDF document text
    • http://citranco.com/users/files/89069274152.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/nerutamazodutadufedowi.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/55999590005.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/80989ce52dfca55a2c4cd89695b7b406/lukolamilajusiwa.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/57225072905.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/78021920919.pdfIn PDF document text
    • http://fkhd.cz/data/img/kifapotozopot.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/satow.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/28379094926.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/vamozuwuxumevufinolapebuf.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/16259624649.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/kavekixabezivi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/jinewevazubedufikix.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bec076bf7177d7bb00391b46bc0db703/89753495968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=olympiad+books+for+class+2+pdf+free+downloadPDF 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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16992 bytes
SHA-256: d378d02acb4f4659bce1a730c02400c0a12d9cf535e6cd726714cc4434494386
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 11260 bytes
SHA-256: 58f8dcfe36a76e98caa057f3ea4c3f21990ce1885f76856cc509961183116c3a