Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ace56032922de3…

MALICIOUS

PDF

75.5 KB Created: 2021-02-15 08:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e573a4d38808a4fb8aa15c5ef42a53e2 SHA-1: 54141975badfec93d693989d65c758b363c5fcf0 SHA-256: a1ace56032922de34184ca1871ded18c433461da14724164ee05e4f4c3e9714e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=root+call+blocker+pro+free PDF link annotation
    • http://sikutamilom.iblogger.org/ieee_software_architecture_document_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5fcbf0ec563e3.pdfIn PDF document text
    • http://sis-paypal.com/mortgage_loan_amortization_schedulefun2f.pdfIn PDF document text
    • http://soluzixod.66ghz.com/the_funeral_sheet_music_trumpet.pdfIn PDF document text
    • http://medyayazilimtr.com/levels_of_organization_in_ecology_worksheet1155n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5ffe1dde1166c.pdfIn PDF document text
    • http://kprovk.xyz/hydraulic_ram_pump_calculationsv7pkb.pdfIn PDF document text
    • http://musc-media.xyz/prentice_hall_united_states_history2ytxh.pdfIn PDF document text
    • http://requiremcgood.com/36362040703n7fpx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_60116089931fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fcf2dca317d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_60106aae9fb1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zidumive.rf.gd/fefanelof.pdfIn PDF document text
    • http://toduwez.epizy.com/jabawibofidoxeloro.pdfIn PDF document text
    • http://vaxokepa.rf.gd/dakorivamofokil.pdfIn PDF document text
    • http://rovuwuruw.epizy.com/panera_bread_san_diego_menu.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/kiawah_island_tourism_guide.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/birdy_tee_shirt.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 4644 bytes
SHA-256: b61977c8f70ae2d082194be9586d6e15163f0f66d8bf9a063201452c6d060fd9
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5044 bytes
SHA-256: b00daf75f6bd0d4b573dcbc197f76ca7f2d74f76e962ae8489cc2cd24c9b199a
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 11952 bytes
SHA-256: a8f51cd4f26490f82091d1c92bb6af9af7c638a73a179b193fe0c8b55c233aee

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