Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1748fd38438131…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 23:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b23ffb2b4bf27feab74504ac98cb0924 SHA-1: ca7dfc49976f85f93012430f5eb157ccdd4c3876 SHA-256: ef1748fd38438131d987950d2efac33abaa67d0d02b9d52492a7ce22b1810fbd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect the user to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/award?keyword=instrumentation+books+free+download+pdf PDF link annotation
    • http://pukitifafizeba.mywebcommunity.org/foxegikaxuku.pdfIn PDF document text
    • http://dupamineni.medianewsonline.com/the_lord_of_the_rings_the_fellowship_of_the_ring_extended_edition_vs_theatrical.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/grammar_translation_method_of_teaching_english.pdfIn PDF document text
    • http://metinozub.iblogger.org/hyrule_warriors_definitive_edition_character_guide.pdfIn PDF document text
    • http://witejafekomip.22web.org/sentinels_of_the_multiverse_rpg.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/bhattacharya_surgery_book_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/60b0d629-8475-4d95-9481-9ecfc12ba037/irobot_960_smart_mapping.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/25783393436.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/bhojpuri_new_song_video_dj_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e57bc5b-2722-4c15-ba87-9e3ad136c52e/reading_comprehension_book_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a637f0c0-24e7-4c9c-8824-bb4b3c337367/permutations_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/jilokitixipopekezuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1df91d-0dd2-436d-b864-ead492a3e073/sejatasufunipokovurug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6359d387-689b-4410-9f77-6b6e6b23631a/roland_aira_tr8_drum_machine.pdfIn PDF document text
    • http://dirivegejapa.rf.gd/mefukinubozixipo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 5304 bytes
SHA-256: 154ce6762b1f67768f60c32901446744d4ec4655031d7a66f711d48788d64666
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10940 bytes
SHA-256: 9a2482e3fad31355ead5e62e06d865487032c4ba3943eb7d8c1b07e610568764
font_02_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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