Malicious PDF — malware analysis report

Static analysis result for SHA-256 58db90d7cd17d4f5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 10:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3936fda51838fd41075dc534a17d0523 SHA-1: 4a685de7c97c7caaea1ddfabc274c03919342da0 SHA-256: 58db90d7cd17d4f51a0edbb971f1560586b45bccbd2d7a67c83d240818dd740f
134 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The PDF also includes numerous external URIs, some of which are part of a link farm, suggesting a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/luvuvujovinemipedizep.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/58658864428.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/xebaragejadufifojebobago.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/podevilibodox.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/bilasigivasarimaxaxuval.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a349a2423c---75321596250.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/61732489795.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-20/20210920083724990696.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nubedukuzofapi.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/84755682875.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/602a58617d44dd04ac0be95d03f6c396/xasuzi.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/98930022327.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/90675835223.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jebobobixusepaxaz.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/15023408047.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/61807813498.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/90368801798.pdfIn PDF document text
    • http://acelybio.com/upload/files/viduborafojedogiwazafab.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/zirojikivufulifazebapare.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/beweko.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/57153347548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=internet+download+manager+free+download+for+pcPDF 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_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 15988 bytes
SHA-256: 7ecb28026fa3ff364d6de94e5aae529a3c668e7d190506d4183d48b7c51b1d80
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 10740 bytes
SHA-256: d00cebee7c476b7909718c36e8a27cc732c36acfc7017cb4044a3dfd23add40c
font_02_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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