Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33cbd025cb3c017…

MALICIOUS

PDF

81.2 KB Created: 2021-03-19 06:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aad099462f6eff0010bd2bc98b13c0df SHA-1: 23db20f6bc35626e124ea9e722cc724a067f90c5 SHA-256: b33cbd025cb3c017faf19c8b5bbe3512f90856bc8a4cbc8cf5097ba63f1df339
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 0.9954

Heuristics 6

  • 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 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://seumenha.ru/123?utm_term=yajur+veda+avani+avittam+2018+tamil+pdf PDF link annotation
    • http://favunewesazut.sportsontheweb.net/frederic_bastiat_books.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/how_to_find_the_value_of_n_in_binomial_distribution.pdfIn PDF document text
    • https://jipukikibowema.weebly.com/uploads/1/3/4/6/134633032/4197702.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/2740181.pdfIn PDF document text
    • http://soul-felt.com/blackjack_table_topea3do.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/d1c2115.pdfIn PDF document text
    • https://renobulog.weebly.com/uploads/1/3/4/4/134464004/xaninazoxibugozegok.pdfIn PDF document text
    • https://lewozokor.weebly.com/uploads/1/3/5/4/135400983/jezareb_xusewurokilo_kadatibesuvalu.pdfIn PDF document text
    • https://pobolibawawo.weebly.com/uploads/1/3/1/4/131437087/4244121.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/6471436.pdfIn PDF document text
    • http://wonder-ita.fun/seseratuwesejozenaa6bq.pdfIn PDF document text
    • https://kaketoxemi.weebly.com/uploads/1/3/5/9/135989659/9756433.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/craftsman_zts_7500_parts_manual.pdfIn PDF document text
    • http://weraka.online/att_cl2940_manual83n6v.pdfIn PDF document text
    • http://persequen.com/before_the_flood_movie_discussion_worksheet_answer_keymtlhq.pdfIn PDF document text
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/3c6976e3a0f1f62.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/book_folding_patterns.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
    • https://s3.amazonaws.com/sesafefanulokam/2648972495.pdfIn PDF document text
    • http://zixupikitudid.epizy.com/berberine_metformin_weight_loss.pdfIn PDF document text
    • http://jufawananifufa.rf.gd/accordatore_chitarra_gratis_italiano.pdfIn PDF document text
    • http://tajiroxajesolut.atwebpages.com/59083390951.pdfIn PDF document text
    • http://patenat.epizy.com/prezi_template_free_book.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/jobasom.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/kubota_d902_engine_parts_manual.pdfIn PDF document text
    • http://taxezoxemukatub.epizy.com/25143898771.pdfIn PDF document text
    • http://zovopabipani.rf.gd/greater_than_less_than_equal_fraction_worksheets.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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 5396 bytes
SHA-256: 4732a22c0163ce199605d4765af9063bfe8ff042467c893327359c2491fa3102
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 10968 bytes
SHA-256: 00ad2993dc440cfa7d9fdedaa2b93834f2e8f09becda628bb1e082e40cca065a
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3