Malicious PDF — malware analysis report

Static analysis result for SHA-256 058053652e6ade55…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 23:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8be00612168155ea1d39f481f32183d SHA-1: 8869a57293d8d31a48506e1f04f43c3b910899cf SHA-256: 058053652e6ade5593ea166a4a49ff884284950337fd8c6f78317cee58c2e412
146 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and the presence of clickable action triggers. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 69 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 http://peak-experience-japan.com/images/blog/file/kekujinakupok.pdf In PDF document text
    • http://optimaglobal.net/ckupload/files/79628098762.pdfIn PDF document text
    • http://ccadl.com/files/20210908075153.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/23767073637.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/fopufezuwanaxip.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82135498546.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/denoxozedivamokuti.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/tabedegidotubozare.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/43177275561.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/45396787929.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/71409677225.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/lesaxuvedazewubozi.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/7955511742.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/20247822944.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/82201c51363a3aeb5c08665e222f183c/68572172855.pdfIn PDF document text
    • http://unibox.lv/files/text/lemaxur.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/52177726527.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/56817783384.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210929082335.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4249abba---68130881666.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/43871065942.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/70534099693.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901231716.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/78807752309.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/diwaxewemalasosiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=present+perfect+with+since+and+for+exercisesPDF 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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 14264 bytes
SHA-256: 9a643a0dee46b22f6b2c4159137211e3ab2d63e9957c58c83e8719c6f55dc7dd
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 10860 bytes
SHA-256: a312853b5a32ba0b79b7b35420e26e7fc41748e493fccf731bf0bfd6c7fc2bd4
font_02_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1