Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb150f88248b2bf…

MALICIOUS

PDF

75.2 KB Created: 2021-10-06 10:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0147dd27fc38344568a3e740afdbbc3 SHA-1: 97fd4bc8da96e21171c5177bbb66f93ebccc647c SHA-256: 3eb150f88248b2bfc5cd044546799fdc91827e7157eaba840a6c9d80703b32b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan suggest it likely attempts to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cnfglgreat.netsociality.com/upload/files/75329764536.pdf In PDF document text
    • http://whuntex.ru/userfiles/file/satozapapidekalugokuv.pdfIn PDF document text
    • http://htygroup.com/upload/files/lozimuvaxewanolivenuvenup.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109240937239743.pdfIn PDF document text
    • http://honda-vo.com/upload/file/96996736750.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/rawulojuguxuvuviv.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/nipagebixisixowopezize.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/3975249724.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/73427731141.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/69250765010.pdfIn PDF document text
    • http://mq-water.net/upload/2804043559.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/judasoxi.pdfIn PDF document text
    • http://pay2pay.net/upload/file/lagidebofewojoxuzifeguxo.pdfIn PDF document text
    • http://gazetavk.ru/img/file/wufilagakoxozoze.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/56lg6adv4robnh1amqhcnd2ns0/sojikizefen.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/37994149198.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/pamoloxabufolixiwaketuvu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b84ed19a9---rivutadojoloj.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/81846558964.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/68877903535.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/78730902135.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/labijevulonavagijanerubij.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/logak.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/45125949576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=diffusion+practice+worksheet+answer+keyPDF 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_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 16868 bytes
SHA-256: c7716dc924f3ca4c3f669604b419828c1e55beaf8ff7556a00b1141ea731eee6
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10924 bytes
SHA-256: 6ae77e609be313be8eb1273337ca1900e8308e19c8f5e171f7438bbe7bedab72