Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdc856496a1e406…

MALICIOUS

PDF

63.9 KB Created: 2020-11-08 05:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 199fa0f021feb935e5d7b6a52f8270b3 SHA-1: 3d1fbd69d77a4e73fe5c407e9790c32eba45cea4 SHA-256: 3fdc856496a1e406405d777b38db885a5c3680cb08ceadda1745a3d9d723d9f3
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffset.ru/123?keyword=the+world+s+hardest+easy+geometry+problem PDF link annotation
    • https://fejagirizow.weebly.com/uploads/1/3/4/5/134525681/dewutakazipivudaxufi.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/65fe7e.pdfIn PDF document text
    • https://xukabasal.weebly.com/uploads/1/3/0/7/130776322/legogine.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/tukefazigumikiw_roxenepo_kavas_venixuwu.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/mukefuxibedekinuj.pdfIn PDF document text
    • https://mawubisevidezo.weebly.com/uploads/1/3/4/4/134480432/8a1a3826d0e3.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835691fa-4d96-495d-a6b9-904a52e4ab98/tapuxevutifovufeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c55d1d-24da-4e2a-afe8-a1aa6d52db49/10665815808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4eb52cf-8c6a-471d-a1da-3dea33019480/define_controlling_idea_in_literature.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/panolinasajavosogojimepaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a58abe9-229b-4071-ade5-753027d18458/tusisetotesujulepinu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00008cfb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8CFB 15460 bytes
SHA-256: d15ec597f740c89610e519dfafaed958ec6f117915e67ed75113d59636dd9298
font_00_sfnt_off000079e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E9 5656 bytes
SHA-256: 4d7d5d5b3308b8b38e4f3096bdb5400abc91a4a48f8b4aa551977465a503a421
font_02_sfnt_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 10684 bytes
SHA-256: 06123e1f5e2ef6e3beb48284c1de2f539dc655cc30b13c527f31c5e3327a9826
font_03_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16244 bytes
SHA-256: 95f48374b0315877804ae8420658b34d51b4bd9fdd6cc7e75132599c8d071cbb

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