Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4733c03bd581c3a…

MALICIOUS

PDF

91.6 KB Created: 2021-03-06 03:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e812ed4dd7a9c41b9f836e1a4c9dedd SHA-1: 15764579d865e8605dece27f173cba98d739d3ff SHA-256: a4733c03bd581c3a6a7801957572cd9bf0b54672fe082b5154881bcd7baad10b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=what+does+line+7+on+form+1096+mean PDF link annotation
    • http://vekvelo.ru/whatsapp_new_version_freem9y32.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/8251813.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/b7d67d9.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/judinarelagixex.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/vovumuruwakumulu.pdfIn PDF document text
    • http://milky-rp.space/69013696719sunxj.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/3467606660.pdfIn PDF document text
    • http://true-board1.club/international_accounting_standard_37xaxtb.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/davinci_resolve_17_manual_espaol.pdfIn PDF document text
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/7695105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xokebore/tabla_periodica_elementos_metales_no_metales_metaloides_gases_grupos_periodos_bloques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b604027e-4c6f-4aab-8338-6c2f74063795/65143449109.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_e82137304a8f4ae0af5278c897f5d037.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b7eca0-ca66-4738-8dc8-a4906684ab65/percy_jackson_the_lightning_thief_book_character_traits.pdfIn PDF document text
    • https://8318a6b7-e0bb-4247-bff5-57c3e3b2654c.filesusr.com/ugd/7a11b0_1258f62f0417424284bb90bf5717aac1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozetej/mabexowutosave.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/divina_commedia_paradiso_con_parafrasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e3b97c-6405-4cb6-8586-502de588dd64/96450042607.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_dba4d7b9598f4d54a1db7c44a8b41b8a.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_ddcf82e422ef44b68938561567da9d39.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_1bd5967339614271811cd8c3380da59a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/gold_coast_fishing_report_july_2019.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/ion_block_rocker_bluetooth_portable_sound_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedf9f1f-d1ec-4225-81a9-7eeae8e47231/conditional_probability_formula_and_examples.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_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 5744 bytes
SHA-256: d88fbd7f83b0f58c315e4008f445db6e623b5a011dbdfcc881dd8fee41e5f1ec
font_01_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 10996 bytes
SHA-256: 9b5b92f51dd4076fe9c618a902e6b4ee7352b77369b92ae2d28e9e19042e28d6