Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a733f1791fff642…

MALICIOUS

PDF

93.8 KB Created: 2021-05-31 09:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 65300294557aebf222aa774aae14e2f2 SHA-1: f2b122a17e191017428456bdda82ad697f55baf1 SHA-256: 0a733f1791fff6424b8ccbb8877bae48d24b232e1fb9e96686ab887d15f66891
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=aimee+semple+mcpherson+livro+pdf PDF link annotation
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/2455455.pdfIn PDF document text
    • https://suxewanevot.weebly.com/uploads/1/3/4/5/134595646/0fb23af16068b.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/fcbac.pdfIn PDF document text
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/4865945.pdfIn PDF document text
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/sibokuxafadakir_xokonab_xegoxotabinuv.pdfIn PDF document text
    • https://soxiforifidulap.weebly.com/uploads/1/3/0/8/130814329/590ad3ccce3ca4b.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/8803834.pdfIn PDF document text
    • https://pedekibitu.weebly.com/uploads/1/3/4/6/134669881/pizuguteju.pdfIn PDF document text
    • https://nixozetite.weebly.com/uploads/1/3/0/8/130873825/6721398.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/7097777.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/dbd4887ff.pdfIn PDF document text
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/ac6a6b1918bc1.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/mekozasenagedivu.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/kerosakuj_fison_jumes_xigutowevigiti.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/ae7015f95d90244.pdfIn PDF document text
    • https://surujesuf.weebly.com/uploads/1/3/4/7/134773125/5c5a9f2cd943eb.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/zativoxuvo.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/6537a550-bfc1-41f4-be0c-bb21a55a83cd/6649827757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95508de-9232-43e4-8319-8c1fd5278256/modema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee474601-655f-423f-8d95-379bf57790c0/45954445840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccd31db-df90-4b09-9968-eedc649ea078/tinufubexoxetejoxevaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a80347c-e436-4c31-9e3b-69f1793acb2d/what_is_the_difference_between_target_population_and_accessible_population_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98375674-fcc2-48c5-91a9-77f78ea7dfdf/75357310995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130b09a5-3da0-4c08-a393-1ff6ba6ecc68/is_there_a_movie_based_on_the_book_crank.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 5236 bytes
SHA-256: a16a1c2eb29afb553a965705011784dd4efd77535c07de312fef5e131e5bc755
font_01_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 13252 bytes
SHA-256: e65d064bd28a4ba24c374ac7d4a15ec5398321724814f485f873b22369075bfe
font_02_sfnt_off000151cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CB 16276 bytes
SHA-256: 6b086cd8c10ff84009b2100ccabb7876b6abc1c8509b9d729c37833644e8e2c1