Malicious PDF — malware analysis report

Static analysis result for SHA-256 05518a7bb757b2d9…

MALICIOUS

PDF

82.7 KB Created: 2021-02-05 23:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0db21f3a186fdd4c887f72a043a4df30 SHA-1: 9c17b14112b129ea39aaf61ae1aff60fa31ce4ab SHA-256: 05518a7bb757b2d9eb847ca36b1fff2fc47d63c614f606d2e8298d7802ba867c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

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://maypoin.ru/123?utm_term=code+white+hospital+ontario PDF link annotation
    • http://varietystore.website/manychat_templates_deutschi8jmk.pdfIn PDF document text
    • http://dewobazul.22web.org/platform_bed_frame_queen_wood.pdfIn PDF document text
    • http://cg-designer.xyz/115100059425fn5n.pdfIn PDF document text
    • http://dirupomavi.iblogger.org/65908875263.pdfIn PDF document text
    • http://weareanonymous.org/get_tough_fairbairn_downloadrfeld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_600ad682af40b.pdfIn PDF document text
    • http://simkosa.website/pemegemuzedugivivzm5o.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://gerireg.epizy.com/rabivegazaxizelo.pdfIn PDF document text
    • http://nolivajujereram.rf.gd/chocolatier_2_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/acr_guidelines_rheumatoid_arthritis_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/transformer_nombre_rationnel_en_fraction.pdfIn PDF document text
    • http://xenemusexo.epizy.com/process_validation_master_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/golawiwozotefimovuposo.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_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 4952 bytes
SHA-256: 4e052dafe78af09bd642d53b2d19afa7d15ed222233005d2e67dc66446e1ffe8
font_01_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 11008 bytes
SHA-256: e5ddbc6f8579b38bc76fd2dbd98784089fe6e6f1498be03bddfb4c0d8f121267
font_02_sfnt_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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