Malicious PDF — malware analysis report

Static analysis result for SHA-256 308e4c59f002ab11…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 16:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ea38979aeef37451e647fa9a9568523 SHA-1: 506b4a1f974f6fefc35b693cf0e6f8e5d2510a75 SHA-256: 308e4c59f002ab11ee754e1eaf606a3ea54a81761c1bc75ae3c36aa1153bf09d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://northcity.rs/slike/files/sowabagekabob.pdf In PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wadiniwefadojatowi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161355c0626477---nowuji.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/26992429612.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/24561032587.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/turenerutigebetafazofi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140b7f61a0db---sonekimosoxemolexazajiw.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/20886830979.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/matutiwawagamaxukaka.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/mabutiwubupijudomerizup.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/48691220441.pdfIn PDF document text
    • http://machin.kr/userData/board/file/xaginodurerudasolarivew.pdfIn PDF document text
    • https://qkon.ca/images/file/31598601840.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/tufavidijito.pdfIn PDF document text
    • https://foulardfotografando.it/file/wakasodot.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/faguweworodazusi.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/54802152195.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-19/20210919150003332819.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/46183166254.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/13814213117.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6359d0f2---54252735704.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/28884890508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bad+eggs+2+clicker+gamesPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 17568 bytes
SHA-256: 04ea5b24744be9e787db882d8959a1b726550c496e355ae336a58d6c6fde4272
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 10656 bytes
SHA-256: 2d76f2e461d6df97cdac12456dd4eedf9d6468980b70e3e09782d1292ccdf281
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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