Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74e04a49d9f1589…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 13:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ada02005fc0dc5acd263a630f76a0c40 SHA-1: 70b9ed4a5ae80b5d79de7843c33582d2dce73206 SHA-256: e74e04a49d9f1589b67d8ebae3a1c76e291861216bc3fe3905d3e73456f43d69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=10th+geometry+textbook PDF link annotation
    • http://dejede.com/userfiles/file/gepiwusirububoraxe.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/10944233628.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/23597500284.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/43a231404fdd598bb1627037dd4d33f4/89007061081.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e8faec3b---77931531292.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918104304524631.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/wifunivivavatuxiwosojej.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/23831945649.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/gabaxozaliko.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/72903038912.pdfIn PDF document text
    • http://rapet.hu/files/ganijomopuzarebubosuma.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/56667607762.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/vuzeleni.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/3488104261.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/89731348285.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/nekanozadab.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/mizave.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/29075889119.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kelonadolopekirazokezi.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/3872279839.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/kejido.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/poxununa.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/72510225886.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/8055933553.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/kasumif.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_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 10508 bytes
SHA-256: 20ddb11490aa08a09ac814784e46d3a4967be6934cc6901007018347ebf4e1d5
font_01_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 18088 bytes
SHA-256: 958dbc1bfdf6ed055a9a24af703c03bfb69ca7cac068936ab56efd8836936a6d
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1