Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba607b2cc82c741…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 11:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 160d6eb54bf73d7e5370598329c00620 SHA-1: 53932a38e9969eb210e4a3dc738305d9128d9416 SHA-256: fba607b2cc82c7417145640df3c5f7fee5eadd0f859b2d0fb3b197000a5c0694
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 0.9998

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://maypoin.ru/strik?utm_term=fedders+air+conditioner+front+panel PDF link annotation
    • http://vizenam.medianewsonline.com/51507397157.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/rolegotolosewimudegu.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/lost_in_yonkers_movie_free.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/singer_201-2_bobbin_tensionbq1iy.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/fill_in_the_missing_numbers_by_counting_in_100s.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/gmat_quantitative_practice_test.pdfIn PDF document text
    • http://apsmall.space/947269937510az74.pdfIn PDF document text
    • http://jidiwaxilo.iblogger.org/ms_office_training_book_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedemigu.atwebpages.com/sivewalarizof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559ac978-d02a-498b-a90e-a00df80e677b/nordstrom_employee_handbook.pdfIn PDF document text
    • http://batapijas.myartsonline.com/6376077685.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/34272884964.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/33217517566.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_393b34afcdba439a89191d46c266889c.pdf?index=trueIn PDF document text
    • http://wosekamilos.epizy.com/african_american_literature_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a4631a-82a5-4e3c-b22b-adc4439766b7/libro_lengua_materna_lecturas_espaol_segundo_grado.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_2cb0a558ce154e078c66f21ef6aad7b5.pdf?index=trueIn 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_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 5104 bytes
SHA-256: df2ba52556ec70bf3da49bfb89c0bdaf9323188b585b2d9170e8930bef2fe7be
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 11224 bytes
SHA-256: 19f700ee1c7cc317704acee02899a828c0f0f442e71b30f888428825247a34c0