Malicious PDF — malware analysis report

Static analysis result for SHA-256 2375af244460066b…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 10:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea78c4f312d1d8bc7a6d352bad357b11 SHA-1: d4772e9fe1fbb7521035ef1c85f52002c7301955 SHA-256: 2375af244460066bd6fbbffface19ff68834727eeb5e68e711995e52a7f024cc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=netcat+manual+pdf PDF link annotation
    • http://rebelliona.online/nifemulejelaxafuxela15el9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415518/normal_5fff96f333547.pdfIn PDF document text
    • http://lalat.space/red_hat_linux_bootable_isojbrfn.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/gfiDidN/dragon_quest_adventure_of_dai_game.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/ib6ngdr/99265906905.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/fsNgdFI/fimovanibubexalugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5febd83ea367e.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/aphis_nerii.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/average_salary_of_legal_compliance_officer.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/hdoVjaN/74732537385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/alchemical_symbols.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_fc12ea7837754ebfa095521a18d74db9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/rasgos_psicologicos_de_la_personalidad.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/homofermentative_and_heterofermentative_lactic_acid_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/hitman_blood_money_highly_compressed_free.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_9f597fc480564999a0a29324ac95ea5c.pdf?index=trueIn 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 4996 bytes
SHA-256: bd599d07f37b03d35cf4ee235a5f8d743611359115801d2dc8f3c94ec9c269dc
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 11432 bytes
SHA-256: 3507f0a2329b50340e6174492d0ae2ef6e02e092018f5026edd1ec38b6767d42

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