Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2a5d123c1e25ac…

MALICIOUS

PDF

103.3 KB Created: 2021-06-05 14:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb12a4fc604b9c782c7ba2d2fc56c448 SHA-1: 2686560b658e6e47e9a0b36275982ab2b801dbaa SHA-256: ed2a5d123c1e25acbe88bffe49a7003d16c48c6bb557f0ea75a5a95cc9cba607
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://catamma.ru/pbw?utm_term=festival+internacional+de+musica+y+danza+granada, which is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/pbw?utm_term=festival+internacional+de+musica+y+danza+granada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413373/normal_606797966e67b.pdfIn PDF document text
    • https://vokudaxavarul.weebly.com/uploads/1/3/5/3/135313771/8edf199ac8a309.pdfIn PDF document text
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/5393312.pdfIn PDF document text
    • https://baxodibidixajit.weebly.com/uploads/1/3/5/3/135311382/vakulapoferunu.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/36644da1d67d3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6067dd135d589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_603b7ee281c9e.pdfIn PDF document text
    • https://korodisoxi.weebly.com/uploads/1/3/7/5/137500929/229d919aadbe839.pdfIn PDF document text
    • https://doxavigefixo.weebly.com/uploads/1/3/5/3/135391607/guxerijaxig.pdfIn PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/450171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_602b7b0356a57.pdfIn PDF document text
    • https://movogabi.weebly.com/uploads/1/3/4/8/134881325/kuxuvisasabisadozep.pdfIn PDF document text
    • https://rufuroborotefin.weebly.com/uploads/1/3/1/8/131856068/luvevopavafaz-sisovitubuzajik.pdfIn PDF document text
    • https://divuleveberu.weebly.com/uploads/1/3/7/5/137502180/paradu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_60195395428da.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/3645861.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomasasawavi.pbworks.com/f/topematarekagafokefirab.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/the_five_love_languages_singles_edition.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/71267109104.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144444561/a_thousand_years_piano_solo_sheet.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/michael_bazzell_open_source_intelligence_techniques_7th_edition.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/how_to_get_free_spins_on_bejeweled_blitz.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144558828/mafia_3_low_end_pc_patch_download.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/jurivubepimigunali.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
stream_004_off00015914.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15914 19016 bytes
SHA-256: 6fa478eafb91eb9e8d6108acdb57f7a23fdefaf256bb306690180bf17f51ab5f
font_00_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 5424 bytes
SHA-256: f50ec20def8e93bd70087c360935e7ee2bbb45686c6dd9abd7b4522a1b84d6e0
font_01_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 10584 bytes
SHA-256: 996ff98efacb84893bc3df7793b32f24edbed9b179992c603196ff5e8ef2c06f