Malicious PDF — malware analysis report

Static analysis result for SHA-256 8331c470b42564f9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 12:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a6da01029467c5ea689b3e4522fde1d SHA-1: 2f431a1f1057e3f362fc71d6948dadeb3f9d3308 SHA-256: 8331c470b42564f9131d03d0ae7efea8df314ddcbf5e46964b64a06755f0cb00
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are designed to appear as search engine optimized content, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=hunter+tannersville+central+school+district+taxes
    • http://buxeletifexid.medianewsonline.com/child_attachment_style_questionnaire.pdf
    • http://suporefebakibur.mygamesonline.org/sosox.pdf
    • https://cdn.sqhk.co/xuxinugad/jihgk8w/aga_khan_laboratory_online_reports.pdf
    • https://cdn.sqhk.co/zanudiwageg/01hgjcI/digestive_system_organs_and_functions_worksheet.pdf
    • https://cdn.sqhk.co/lutotilivik/yfBggih/2009_triumph_bonneville_t100_owners_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kogivekadavan.rf.gd/14863114002.pdf
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_ff0aa85c1c2d4ae7ad54b41b629e800c.pdf?index=true
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_30ea9b244ee44f90859d59ed57ea2761.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_50ee7a6c781b42dfbc0b88a1d3a5af21.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b919bf0-e3b8-45e0-9ccd-bb351398a8c0/abu_garcia_black_max_baitcast_combo_review.pdf
    • http://bikaduwixunu.epizy.com/44019375209.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_11b942b91e344256b2a65690f8340b25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/607cd75f-6671-475e-b365-d350263ef29c/how_to_program_a_xfinity_remote_to_a_magnavox_tv.pdf
    • https://uploads.strikinglycdn.com/files/0b6c08aa-48bb-410f-a059-a7c06af48936/venov.pdf
    • https://uploads.strikinglycdn.com/files/78fcc79a-cd85-455f-ab76-c2346fcb717a/zuvurowove.pdf
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_2d9f477ede0e4bf59265317fc46cc84c.pdf?index=true
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_d524b4b82ed247c5befad4f9bf2272ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c93a06c3-7587-4acd-b6a2-44efaabb7b38/40210734202.pdf
    • http://jinugiwi.atwebpages.com/arthashastra_in_marathi.pdf
    • http://lojibovel.myartsonline.com/reading_comprehension_worksheets_4th_grade_multiple_choice.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6dc.bin
66e699b0332e65beeda6e63576019711daa398820e14a368357ca0d787744814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 5116 bytes
font_01_sfnt_off0000f83a.bin
fe294c5dc43f766a6d5eee1971a843876885790126c111bca1a6d0bfe5bcfcc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10916 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.