Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f78c94736115409…

MALICIOUS

PDF

93.7 KB Created: 2021-03-29 09:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f4e0aa259b2d8aa5856831feddc8aa75 SHA-1: d7c127bfc44e0eb4264ef4808dd318de8c22f09c SHA-256: 9f78c94736115409bf8b3dfd4fd3f4a67dfe09e9ef5f3ec3478e78ae2d8766b5
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 many pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or SEO poisoning.

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://jumiwimov.ru/strik?utm_term=intertextuality+book+examples PDF link annotation
    • http://pycnidwzxc.info/siyahamba_lyrics_and_musick3v32.pdfIn PDF document text
    • http://faceit.su/how_to_attain_food_securitydsrl7.pdfIn PDF document text
    • http://shoop-fm.ru/jolotowejedekogedajb31rq.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/balunugu.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/charles_dickens_barnaby_rudge.pdfIn PDF document text
    • http://all-system7.work/59352686974ax6mb.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/nodole.pdfIn PDF document text
    • http://2022god.com/climate_graph_template_tes0vit5.pdfIn PDF document text
    • https://ralevenewuw.weebly.com/uploads/1/3/4/4/134464099/9377180.pdfIn PDF document text
    • http://wosedumuf.mywebcommunity.org/52805176513.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/unicode_characters_table.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/8837293.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/d8495c15-b788-4365-bd6d-0fd6991238c4/canon_speedlite_430ex_ii_price_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c33747-5f29-4ebb-9886-3e0afa9a5bd4/pathfinder_iron_gods_download.pdfIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_c6eeb68b4b534282812c91c217cc39dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee8c2d7-44b7-4efe-bbbd-4621f0532632/kenmore_70_series_washer_repair_manual.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_8e44d797a5ca4f17b3a200ff3cd9ad18.pdf?index=trueIn PDF document text
    • http://tajavuminona.atwebpages.com/writing_formal_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d313d5ec-4588-4b9b-a964-be57b97aa9e9/22887907112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb510088-aa8d-4d3d-951d-e99a3500b077/how_to_fix_black_screen_on_acer_laptop.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_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 5156 bytes
SHA-256: 59ff0d6ab65806aa6a77616716ac7560156dc532b66bfabf32763fc03dce07ec
font_01_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 11792 bytes
SHA-256: d49672e5cd7a922f63b7403da41c4170eb642b98dcf8f4b6ead86b10b08b47e2
font_02_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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