Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d5712f0b1ddc5d…

MALICIOUS

PDF

82.5 KB Created: 2021-04-10 18:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 89899460cacf50f49828c5c9e5731723 SHA-1: 50290b7d9bd6cfb4e20577e0abd5e6ad9cb6f7bf SHA-256: 84d5712f0b1ddc5dce3156267b5aaef9cda537d933c728a0080add9a31e2f545
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs, with a primary malicious URL being https://ponafet.ru/strik. The document's structure and embedded links suggest it is part of a link farm designed to redirect users to potentially malicious content, masquerading as a book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=day+of+tears+book+pdf PDF link annotation
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/27e270.pdfIn PDF document text
    • https://cdn.sqhk.co/vozofugova/hjNhh1v/kirejaseferuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ejcjc8j/wolof_phrases_how_are_you.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/vipepuzaka-gekemarejem-jowurirasi.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/distribution_binomiale.pdfIn PDF document text
    • https://cdn.sqhk.co/vemunaxudug/BjgrjfW/cowboy_game_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/N7gi1jd/diced_tomatoes_can_carbs.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/buwinibama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_7833a41c3d53402b8d09a95554671b57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73419f8-a81b-422f-a15c-f5e376a207f7/what_are_the_types_of_training_in_hrm.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_fe83ff01d5784643a986cfcefc349e01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/conical_pendulum_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/indian_cash_book_format_in_excel.pdfIn PDF document text
    • http://tipatanakuke.onlinewebshop.net/ielts_academic_writing_questions.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/reading_comprehension_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/aprender_japones_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/eleanor_rigby_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a294fe-d111-48e1-96ef-b3a095c2f84b/99746712183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98022ae7-ce18-49aa-94d0-7a50429e7668/what_is_the_meaning_of_the_song_rivers_of_babylon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 5308 bytes
SHA-256: 26a1969c03391c8a52242fa2918de4159eedfd498f9496fe0b942e44e9e970b7
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 11072 bytes
SHA-256: fb4425f5da9b3c99ccd5a5fd6b83a4663ec75f83f83aa23951654edb296b2866

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