Malicious PDF — malware analysis report

Static analysis result for SHA-256 28deacb1476a6121…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 08:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b3402971c29e0bb717fecf619e72760 SHA-1: b59ac93d08965290e1f1b26ed1e91630b3033eac SHA-256: 28deacb1476a6121b7e1f51f92f4e083797bab088ab83ad265bcc5f19c95496d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to potentially harmful sites, possibly for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://kuzutuzo.ru/strik?utm_term=fiction+story+ideas+for+4th+grade PDF link annotation
    • http://polypak.site/how_to_get_projectile_protection_minecraftzs6uw.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/mgiPRuz/wowara.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/kjjiiia/download_guns_n_glory_heroes_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/jfibjgW/dwight_yoakam_suspicious_minds_chords.pdfIn PDF document text
    • http://fc-aromat.ru/public_relations_manager_job_profileu55tu.pdfIn PDF document text
    • http://femalukus.iblogger.org/algorithms_illuminated_part_2_graph_algorithms_and_data_structures.pdfIn PDF document text
    • http://irbestate.ru/bujizohny93.pdfIn PDF document text
    • http://a1metromovers.com/55798849205hljmo.pdfIn PDF document text
    • http://0fruits.space/nozareses0j8ka.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/jbqQiiX/best_3d_printer_for_metal_filament.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupepitasaxisal.epizy.com/bj_novak_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f089926-2615-4f98-b5f3-06aab4eceaed/tres_metros_sobre_el_cielo_netflix_cast.pdfIn PDF document text
    • http://kutifakibidi.rf.gd/58347039298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058351dc-4886-4269-ab77-8319fc58fd7d/77083050726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52a9288-58ae-48fc-84bd-562dac2ed8b7/32250828736.pdfIn PDF document text
    • http://wonerofekuber.epizy.com/86532598053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c560a7c9-f98c-463e-a9c8-5b43c8d4ccc8/go_math_practice_book_grade_4_answer_key_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e0ccc8-31d2-4fa4-ae6b-48520abc6ab4/word_2013_modification_is_not_allowed_selection_is_locked.pdfIn PDF document text
    • http://kofipazefoleris.epizy.com/52608911828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5205b525-deef-43cf-8812-eb26a33a15c3/17293997227.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5396 bytes
SHA-256: 91658e9e2a74011e6e5729b8ecda27deca1196c1c8f5e39afd6d6d90bcc83d3d
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10228 bytes
SHA-256: a09ce867f345af4305f143f0cf82f6484143ca1201e3dcb040bfdd16a762a880

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