Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec64fb79919bed68…

MALICIOUS

PDF

75.4 KB Created: 2021-06-12 06:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c677c5d1f37c4de6af177b5acd660823 SHA-1: db3778994e06b8df00b0c03c0ac17fd8cfac2bc8 SHA-256: ec64fb79919bed689c9a0401c1b10adbb26410971c36dfd106371dd2cf9d8969
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a primary suspicious URL being https://drafthe.ru/pbw?utm_term=evgeny+grinko+valse+piano+notes. The document body, though heavily obfuscated, suggests a lure related to 'piano notes', likely to trick users into visiting the malicious URL for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=evgeny+grinko+valse+piano+notes PDF link annotation
    • https://banabujoro.weebly.com/uploads/1/3/0/7/130776007/wutaganurele_likefabekuwi_mijilo_bedobotot.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/2c2e88925af25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesababa.pbworks.com/f/vudubifewitilajazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c59de31-7c08-4dee-b518-5304f20d6b30/lusorewimojo.pdfIn PDF document text
    • http://gufikugefisu.pbworks.com/w/file/fetch/145006332/color_vision_test_book_download.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/velebijezatup.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144667911/86928327322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b8455d-7f7f-4d34-8993-216ad1de5005/is_dark_energy_pre_workout_safe.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/42545193911.pdfIn PDF document text
    • http://jutopar.pbworks.com/w/file/fetch/144655818/fopot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2ed1df-e23b-4848-90e4-a516f09e1889/how_to_say_yes_in_french.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/riviruvijibadogobo.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/phrasal_verbs_list_with_malayalam_meaning.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/145062744/brawl_stars_apk_for_ios.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/how_to_fill_the_ielts_answer_sheet.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/f/how_to_get_only_filename_in_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb640006-7702-447c-9a41-82d2c88eed4a/1972_oldsmobile_cutlass_supreme_repair_manual.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/62763588262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63d9619-32c9-42e0-bbb2-15dcd25aa6cd/92980632471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7889d819-53cf-41d4-8d5a-1eccf366d4fb/stand_still_meaning_in_urdu.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://scripts.sil.org/OFLIn 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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 5168 bytes
SHA-256: f166885d6f50169c8cc7f6cc2d228c2b0e6fda6fbd5128c9740ec8aef0792117
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 13872 bytes
SHA-256: ad3bd4056ccef11849fb34c3e2f46ad4c25ffb261597fc3a9976d94909c93e7f
font_02_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 16060 bytes
SHA-256: 2cca29575edef7a9880cf400a7847cc5df22ba1ee7edc19c7b9bafe603f6c979