Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c68c62092779851…

MALICIOUS

PDF

89.4 KB Created: 2021-03-29 17:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d06dfe808041f0526ec8ef8d4f215fc4 SHA-1: 55eda3823542b7edec9e4db3fb0d109017674a22 SHA-256: 2c68c62092779851dcb160351ca028cadac00bb305b57ce304b3eb6b07e37412
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 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=arap%25C3%25A7a+s%25C3%25B6zl%25C3%25BCk+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372104/normal_60459ddeb1108.pdfIn PDF document text
    • http://badge-verification-center.com/recliner_mechanism_lazy_boy_electric_recliner_parts_diagrambt164.pdfIn PDF document text
    • http://bexunorisomev.iblogger.org/gapemozibuguwes.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/best_free_reader_and_editor_for_ipad.pdfIn PDF document text
    • http://seropuxaxogel.22web.org/laxekevugetuperufodiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_603e8b936d69d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495838/normal_5fcfed241926c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_6018022716714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379035/normal_5fc74971c3dd4.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/62044623841aibgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_6052108f106e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fc9a70243906.pdfIn PDF document text
    • http://tilosag.mypressonline.com/8736698029.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/lezunegewukazanuvas.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/dukipufikatuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_603f4f0736ca0.pdfIn PDF document text
    • http://pribor-poverka.site/semawodisadidizemuy60ls.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/articles_of_the_constitution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc5e99defa.pdfIn PDF document text
    • http://circulshtangcalip.website/dlp_symantec_data_sheetdze7x.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/conversion_de_grados_a_radianes_y_viceversa_ejercicios.pdfIn PDF document text
    • http://sellforce.ru/sciatica_stretchesjlbpl.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://xevikosurozogin.rf.gd/iti_aliganj_lucknow_admission_form_2018.pdfIn PDF document text
    • http://setopuvoxuz.epizy.com/manitoulin_island_fishing_report.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011937.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11937 26704 bytes
SHA-256: dc033930a50d1b6aec226dd8cd5c85d8e7c95c9902e90a91b6958180622c8c8b
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 4904 bytes
SHA-256: c24c00ef9579189356c7d30fcac4c68725e0d4dc68b2aa9f9139b27ac6bf75a8
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 12864 bytes
SHA-256: 6a0759d4d30e592ce4ccbfa2a6c77b7a8b829cfae45bc8e8b98c7677e0e09dad
font_03_sfnt_off000147e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2