Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2b8cad78b79b00…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 15:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aee25af69b660d6c999c285d1a7e6ceb SHA-1: 5ba91982dd068cae0a57473ff7fc1694875e6557 SHA-256: fa2b8cad78b79b002549dbde34def8d5d2bfb37249afec56a8963a93b3b0249a
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 0.9997

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://golowaki.ru/award?keyword=barreras+administrativas+de+la+comunicacion+pdf PDF link annotation
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/zuzox.pdfIn PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/3d6ccf783d17e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_602b542976c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60178b462b255.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/master_of_the_universe_lyrics_pulp.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/8977965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_6035681b6800c.pdfIn PDF document text
    • https://limavewudadeku.weebly.com/uploads/1/3/5/3/135323498/malosarakepulibanog.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/human_anatomy_and_physiology_all_systems.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/dirumedasuwotebunedip.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/4359384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa92308-6052-49a5-b38e-6dde0040ba8b/sketchup_pro_2020_license_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/41110928721.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/one_thousand_and_one_nights_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef543f8c-f1e8-4509-84fb-5d40331fa65f/how_to_deal_with_disruptive_behavior_in_class.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/48187747904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40103c21-351e-414e-9498-f54382db077d/tijofojobiwuwisezitif.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/kinemaster_pro_chroma_key_app.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/romutaxitejegema.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/cutting_edge_elementary_workbook_third_edition.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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 5412 bytes
SHA-256: 227bdcdbd9b0422dbddd641aa7795a87a5d234f52b9a4ade4fea373bac0aa6a0
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 11500 bytes
SHA-256: a978df0f6f9577d8072446d2515213a0c8b2d908d250f18a24889779c7b32ce7

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