Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb9dbd9345cbeb9…

MALICIOUS

PDF

81.4 KB Created: 2021-03-19 20:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa3e7ff1ca1f96ad9244f9ffec814447 SHA-1: 73f1aee5c6a0f8a6e18cc284376bf801aaf52c84 SHA-256: 6fb9dbd9345cbeb9bfab645d758b6639d3747d9da01d36a2e561369ceef88c41
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a disposable hosting service, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which can be used to generate PDFs from web content, further supporting the idea that the PDF is a wrapper for external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/wix?keyword=shading+and+value+art+lessons PDF link annotation
    • http://becloud.website/sasukedevavaqwiqa.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/kibugodogolokedavegotudij554e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcacaa54949d.pdfIn PDF document text
    • http://just-gopro.com/rezajizub8ii97.pdfIn PDF document text
    • http://gtomishebs.xyz/john_deere_14se_service_manualz4j5i.pdfIn PDF document text
    • http://rasezinetoge.iblogger.org/blank_world_map_with_country_names.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_6029ce8eb936b.pdfIn PDF document text
    • http://vipmanmarket.space/table_centerpieces_for_new_years_evegqjk4.pdfIn PDF document text
    • http://nout-prokat.website/living_with_himalayan_masters_book_free_downloada7qsk.pdfIn PDF document text
    • http://sportplays.ru/liwugozasodexolab67dj.pdfIn PDF document text
    • http://vobosivadujilep.22web.org/posavimumivosamiw.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/initial_d_5th_stage_soundtrack_-_the_top_lyricsikrw2.pdfIn PDF document text
    • http://tizedamini.iblogger.org/37236997414.pdfIn PDF document text
    • http://paksorond.xyz/tumojonaisxn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_60368af101518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fd1c33878d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60172ae8c3181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefamuw.rf.gd/koxowidejimijafoxiridob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4f1f95-6647-4cee-8bad-8fc60fdafe30/20456262378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dea0f8e-038a-4d1d-b987-977da7892bd4/19349098386.pdfIn PDF document text
    • http://fuxotarukiroro.rf.gd/54910906523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc10688-2257-4b52-8471-b76872142951/wizard_leveling_guide_ragnarok_transcendence.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_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 5252 bytes
SHA-256: 81782c2bb75157d6b15727c0c344e830ecd3e410f771667a167c14a34ced8a30
font_01_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 10988 bytes
SHA-256: 0013e126a82ac8612a8bd8a7d928c0cf973e508c663047518dc126a9f7ecc3c2

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