Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8a93e87fa0fbf9…

MALICIOUS

PDF

77.4 KB Created: 2021-02-27 16:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61d4b0e007815ad0475184366bb27ff4 SHA-1: d173c9f75509644a866f652618f6a318e331fb34 SHA-256: bd8a93e87fa0fbf98e96d104d485e39f132e61841ecaf2558d5edaa4cbba00c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a pretext for directing users to URLs like 'https://leonvi.ru/wb?keyword=how%20to%20clean%20printhead%20on%20hp%20printer%206978', which is likely part of a broader malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wb?keyword=how%20to%20clean%20printhead%20on%20hp%20printer%206978 PDF link annotation
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/warere.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/2480155198.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/zadularesitefojejepok.pdfIn PDF document text
    • http://vbruti.site/surodasakatatem4ynkd.pdfIn PDF document text
    • https://zomusabizexeko.weebly.com/uploads/1/3/4/3/134317177/mekoxi-bezofe.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/explain_how_atoms_or_ions_combine_to_form_compounds.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/vajibigigezi.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/36661c0.pdfIn PDF document text
    • http://idealicaufficiale.website/8496646602482jdp.pdfIn PDF document text
    • http://helpcontactform.com/android_game_hacker_software_for_pcrhja8.pdfIn PDF document text
    • http://like-store.site/atlas_affet_indirp2g00.pdfIn PDF document text
    • http://kersita.space/wotabadogezun.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/ijuG4jj/hill_racing_pvp_mod_apk_revdl.pdfIn PDF document text
    • https://xenewonunawof.weebly.com/uploads/1/3/2/7/132740417/8aedc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukosivujuxu.atwebpages.com/58296384740.pdfIn PDF document text
    • http://mugekalamiwatek.epizy.com/5826578817.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/xekin.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/11980601843.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/63603504364.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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5620 bytes
SHA-256: 36ecc708d0e9261c73b00987c294be8f343413bca58217fca9fe76a15e9e3fa8
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10128 bytes
SHA-256: 7313b9dcd2d601598f6c692e82670d0e69b07f6baff19ccfcccf96923ede0550

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