Malicious PDF — malware analysis report

Static analysis result for SHA-256 196a4b5851b63339…

MALICIOUS

PDF

79.2 KB Created: 2021-04-23 08:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5bf6280cc2213e3d333377af7b57ec89 SHA-1: 25358e3245f2087ba893edfb7ad5c38c5a7c890c SHA-256: 196a4b5851b63339c9b374c552b04342ef8674023df80e080d5cfcfabfc7bb4d
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, many pointing to disposable hosting, and is flagged by an ML classifier as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the document being used to distribute malicious content or redirect users to phishing sites. The presence of external URIs suggests an attempt to lead the user away from the document to a potentially harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=is+it+legal+to+sell+homemade+food+in+california PDF link annotation
    • http://kernig.store/selesirudukupaxu2g62g.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/roman_breviary_1962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_6051464328038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_6058d7e81ebdf.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/faringitis_bacteriana_nios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5fdec88a75b7c.pdfIn PDF document text
    • http://subenoji.iblogger.org/pokix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_601fac864e492.pdfIn PDF document text
    • http://all-host.site/wapking_movie_2015_hd_bollywood5ejvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_5fdbe1635bbb3.pdfIn PDF document text
    • http://copyrighthelp.info/45536353448l3t5y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fe086d373de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fe7f72638a01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirexadugimog.atwebpages.com/sadofibevuwibibuzamikat.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/popimutuwinuvudabuzibafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2620861-12c6-4be1-9fda-8d7a4db924f2/44345836268.pdfIn PDF document text
    • http://dexifuv.epizy.com/black_and_decker_cordless_trimmer_20v_manual.pdfIn PDF document text
    • http://fijazatomowov.epizy.com/arm_assembly_language_programming_in_keil.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/weight_training_program_for_beginners.pdfIn PDF document text
    • http://dufawivib.epizy.com/janatha_garage_movie_full_video_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39e4ca9-e933-47b7-b3f4-9bc0b43a1d48/dbt_training_workshops_2020_florida.pdfIn PDF document text
    • http://zugukasamudin.epizy.com/td_jakes_books_read_online.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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 5372 bytes
SHA-256: fa3df7bc05a2e063846d4f68d85f5b184bbc309eef3a7b23a567bb385475b1c2
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10604 bytes
SHA-256: f0a0a41f4de66ee454a41e2aaff7e7eb7bf07dff80baa5c1183aa2aa38754325

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