Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a49b0bc5053d1e5…

MALICIOUS

PDF

81.6 KB Created: 2021-02-25 10:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a7a6da7cfbf4dc8448fd0f79897a8254 SHA-1: ef78d4219a5e9aa9d4065ef02148d142015df6ab SHA-256: 2a49b0bc5053d1e55dd8fec976c2d5a589c5a4c2a24c72a46b7873085e627587
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 0.9998

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://druttle.ru/123?utm_term=dan+brown+robert+langdon+book+6 PDF link annotation
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/dufuzexu-rowobawusus.pdfIn PDF document text
    • http://wufobezivanas.iblogger.org/47278732612.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/6048489.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/rixaxenutiwop.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/sipugaguzu.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/muwakugisolezamu.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/mukodafakeleko_fagobakazejef_wogisubidexiz.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/9004732.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/what_is_in_a_soft_taco_supreme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxakufas.epizy.com/80695345295.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/read_a_court_of_mist_and_fury_online_free_2novels.pdfIn PDF document text
    • http://goviragukipi.epizy.com/after_effects_intro_free_template.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/bhojpuri_video_song_dard_bhare_gane.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/jovos.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/how_to_clean_the_krups_coffee_maker.pdfIn PDF document text
    • http://dunugamufaj.epizy.com/zifexituwoboxag.pdfIn PDF document text
    • http://sivigowukom.epizy.com/malachite_green_solution_safety_data_sheet.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/zevukasogevowarutegukuwif.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 5264 bytes
SHA-256: 5c06ba61d6f79fb185798d7180092da9ff23052a5c90853ea5acbc85b58bc931
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 11540 bytes
SHA-256: 05940aab903589b1f12d1fc1e1ecf7f890f19f917cea7c801751927ca300961c

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