Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaa5e7bf1c9e8c4…

MALICIOUS

PDF

88.5 KB Created: 2021-03-06 04:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: be4b05f7ddee775165674326e4a9b18a SHA-1: 53c12b5b83dc4cee7944061547a41d908788833a SHA-256: acaa5e7bf1c9e8c4658e06f521dd5d44b12dd81b14f5a17c4e591e8f213e5f1b
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to disposable domains and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=letting+ana+go+pdf+download+free PDF link annotation
    • http://sallely.xyz/banakisopufeozcb.pdfIn PDF document text
    • http://vavesojijakoju.iblogger.org/12588941094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5ffd361a8c92e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fd8352e91c5e.pdfIn PDF document text
    • http://tufidifegoz.66ghz.com/pitch_and_loudness_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392457/normal_6006112ccc059.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/how_to_turn_on_heat_on_mitsubishi_electric.pdfIn PDF document text
    • http://fasumidivojasuj.iblogger.org/mkt_bhagavathar_video_songs.pdfIn PDF document text
    • http://niverokime.iblogger.org/how_to_explain_the_rhythm_of_a_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fe5512a0e09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_60272792b0b49.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/dipibojefolurevu.pdfIn PDF document text
    • http://ver-alex.website/school_management_system_open_source_free_downloadwotq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_6042c135e3080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://robinovedibepo.epizy.com/zivupadusat.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/pizovetuvurafetilobenor.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/wagizitigibixozid.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/poxogexurew.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/remstar_pro_m_series_water_chamber.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 4852 bytes
SHA-256: 9bb0431b4cb8862e80b13d25f2581e4483d4279b09e78415422f527bded063a6
font_01_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 10420 bytes
SHA-256: 95d1c0995e7299a4ce3365a931bb75b2c9f7ff1c60e723f756b82bf704a5469e
font_02_sfnt_off000146a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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