Malicious PDF — malware analysis report

Static analysis result for SHA-256 169de1c1785175c7…

MALICIOUS

PDF

73.1 KB Created: 2021-06-06 10:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81d31a4d26c60060b2b374bb6ea1528a SHA-1: c8d936a196c4740abb771962638c888de0c99e39 SHA-256: 169de1c1785175c7d2e772780d687600f348ce3c8425f234827703417cb7025c
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 0.9988

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://allytemp.ru/pbw?utm_term=biology+alberta+20-30+textbook+answers PDF link annotation
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/konabo-dudabinifebaran.pdfIn PDF document text
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/2611245.pdfIn PDF document text
    • https://xusumenebob.weebly.com/uploads/1/3/4/4/134478057/2680846.pdfIn PDF document text
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/aa7019d.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/9379026.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/1b0b0700e9de.pdfIn PDF document text
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/504d60.pdfIn PDF document text
    • https://xifufakeva.weebly.com/uploads/1/3/0/7/130775652/59d15d7523c8.pdfIn PDF document text
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/2f6039c13855.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/kukebuwaja_xerobugumupefi_gedofabikode_taned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144713823/pojorijuzenefabefukufa.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144578688/66916247239.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/sea_of_thieves_mobile_game_download_for_android.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/lijajulevasilafubor.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/17451514131.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144502281/volalafubuwepulorab.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144646143/cornerstones_of_financial_accounting_4th_edition.pdfIn PDF document text
    • http://wexagiz.pbworks.com/f/66078107889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4274bd-cfa7-4339-bec8-6bf2090b1831/24504826907.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144624291/judepelomidoson.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144711348/coulombs_law_problems_worksheet_answers.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/juparonewoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d9b867-466f-4967-9288-ce015d7f1fab/womupututimek.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/1421833928.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_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 5628 bytes
SHA-256: a7d0c9bf2d8b30e689f6c665c1a29de4ffc320b4e3198b72df4afb22fc7ce317
font_01_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10360 bytes
SHA-256: 8c2fb95ef17656577da31b2b9fa97ce3d4246d1c7bf9f1e0a5b3dce00c351fe5
font_02_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230