Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5637ecea53e224…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 22:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7864f010e55fde5e10ce94a9ebdd18e6 SHA-1: 9e0b008daf7031d28c41379cecdee1829115864b SHA-256: bb5637ecea53e22417c1008e2e3880b7e23ecd06c484b1e42bb5ab72d5977d5e
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=character+arc+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5fdae620c2eaa.pdfIn PDF document text
    • http://pubguckazan.com/toefl_test_vocabulary1u9nm.pdfIn PDF document text
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/a853288a4adae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_6031d15db5a4f.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/99039572034j3dqn.pdfIn PDF document text
    • http://salonhq.xyz/balutajenogiwighh0g.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/paxunu/math_141_contemporary_college_algebra_homework_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/12226282715.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/73268480553.pdfIn PDF document text
    • http://jilovin.epizy.com/wozedowinu.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/free_blank_cootie_catcher_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/26270991991.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/captain_america_2011_dual_audio_720p.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 5272 bytes
SHA-256: 8802c519464b67b6e9757fdc1d735a5449175754be82d4ef8026652ea68282fe
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10380 bytes
SHA-256: 33d82612d188f55bd672efbdc522e709cb09c4eab727bb4358f7f2c57daf96b7

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