Malicious PDF — malware analysis report

Static analysis result for SHA-256 310a64c589ca817d…

MALICIOUS

PDF

41.4 KB Created: 2020-10-07 07:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f161ea7996667691d63983c89a123647 SHA-1: 8a880188bffbd18c616dcd4d586f21eb7da024af SHA-256: 310a64c589ca817dcb3c6dd101b5e0b8d8b747db4dba5c4f46b9ff3a2be83f1a
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://cctraff.ru/strik?keyword=ejercicios+resueltos+sobre+estructur In PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/88328110686.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/zasiweravi.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/vowelegopu.pdfIn PDF document text
    • http://xakab.ineshipolito.org/uploads/1/3/0/7/130738711/puvol_filunudamukobi.pdfIn PDF document text
    • http://files.kikayscleaningservices.com/uploads/1/3/0/7/130739536/rutivalupox.pdfIn PDF document text
    • http://files.thegirlsfromguantanamo.com/uploads/1/3/2/6/132681938/2217839fd6588e.pdfIn PDF document text
    • http://files.juliesoliloquy.com/uploads/1/3/0/8/130814066/basogenazupibud.pdfIn PDF document text
    • http://sexujaki.ettasclosets.com/uploads/1/3/1/3/131380600/6cdd2.pdfIn PDF document text
    • http://files.ramblinghouseshow.com/uploads/1/3/1/4/131407708/b3139d928eb1ae9.pdfIn PDF document text
    • http://bisesowu.theater4life.org/uploads/1/3/0/8/130874493/mepawogowilopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b58ef11-b20a-467e-8245-55f67ac0da1b/ponakotibomovikew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57d2d16-64b3-4512-bdbd-7f1b2a14e0f9/47761897423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2260cba8-83e9-4aa8-a6a0-7e6039b11723/gapijotifose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c17c03-36e1-4c8c-956e-fa4045ac61d4/pigofavarikelugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524b00fd-4b76-427b-9294-687d5e2dc719/wupiwej.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_off00005fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 4756 bytes
SHA-256: a5f27afd02c97ba8036bad8bdcaedc91c591d88c6fd906fad2dd62257b376c62
font_01_sfnt_off00007028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7028 11972 bytes
SHA-256: 9f1a33ccb7e6e9ed297941d808f1025a7bc16bb9465325395828578345e6d3e0

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