Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba8fcbd7d51ca35…

MALICIOUS

PDF

78.8 KB Created: 2021-03-05 18:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 349a8c815e815ccbb068f59244b736a9 SHA-1: 603dd59f5fdd4229048c582de39060b9fcf29619 SHA-256: 3ba8fcbd7d51ca3570c46ad6af3cc7abe2e647fa54d1ccd638aa96095c5a4355
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://pelibifir.ru/wix?keyword=fake+bank+statements+chase PDF link annotation
    • http://vekisonoloze.sportsontheweb.net/vaxuwaxupuvewarija.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/78434789301.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/senabo.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/sikavotikigixivuxevafese.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/when_did_bc_and_ad_become_bce_and_ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safedoguno.onlinewebshop.net/57227747168.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/carbs_in_sheetz_cheese_curds.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/seruduz.pdfIn PDF document text
    • http://pokukalaso.rf.gd/protein_foods_veg_list_in_marathi.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/formas_de_preparar_chorizos_parrilleros.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/temedevutoketolatojenatud.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_855d27e5b9b74bfc9bfd68ef43d7082c.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_c1d522bb9f504b9ab0639cefe112917b.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/chinese_civilization_a_sourcebook_2nd_edition.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/pefel.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_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 5068 bytes
SHA-256: 3372b93921e5c68a544ee5f0b6c154aa66158a48d25d9a907bc4175660e7b686
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 10996 bytes
SHA-256: dcaed3cd06110b4b87c2b2f34d6c0a4544e4cc7d777cc3122a429a91254c4323