Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b52641bc74e41c…

MALICIOUS

PDF

65.5 KB Created: 2021-04-06 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d10f95ccff26d55b8dc2c324f5c6db85 SHA-1: c4a6471603835307308c186a7cf1f48af84ade29 SHA-256: e9b52641bc74e41cd6b18662ab16e8e265e8a1c3aca94df50e1e70e076c9b626
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://vilenefex.ru/strik?utm_term=probability+and+statistics+textbook+slader PDF link annotation
    • http://hairhome.moscow/vumaxukafuziratudorixilpwb6x.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/lilogusigisigolepoxu.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/english_vocabulary_test_with_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5fecca6aba959.pdfIn PDF document text
    • http://ifeelgood.club/ios_11_launcher_for_androiddsc57.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/chemical_bonding_notes_class_10.pdfIn PDF document text
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/tixuwusawalopun.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/ayyappa_bhajan_songs_lyrics_in_tamil.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/runudidaf.pdfIn PDF document text
    • http://doctora.club/mass_air_flow_sensor_pptgd32c.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/1579525.pdfIn PDF document text
    • https://mapokelamoda.weebly.com/uploads/1/3/1/8/131856574/c2eed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_6044de157fd3e.pdfIn PDF document text
    • http://pannochki-art.com/149528159242ln4e.pdfIn PDF document text
    • http://gatorama.fun/64795789131ej1dn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_89fb8fe74d504e899f9b7b249ef5ae14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/critical_analysis_essay_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/tesubixawetefofisabusezap.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_43178cb7c0354391b44ab417d78f8013.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/technivorm_moccamaster_manual_drip-stop_brew_basket.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_6cce0b909e4447edbca15861e91e9d29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/5661408515.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_7f24abd715154b92a4a68f74519f34f7.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_off0000c49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49B 5308 bytes
SHA-256: 2e83929b76a9c15a45b531a5819c27440611c0e049eb151ecffa5005fb2f8ee4
font_01_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 9284 bytes
SHA-256: 289b0aa9ac39794567da5ed89faeba3c95b4dd194eb5d50cda2dc0144efb9091

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