Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcfbde6d9df7d5f…

MALICIOUS

PDF

89.1 KB Created: 2021-04-23 20:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b0856492a62f4088ac2a92d132247eb SHA-1: 8cc09f669e5b689e570eddd8676ba89158f9f447 SHA-256: 7bcfbde6d9df7d5fcdb09c82d15cd0fd30d8c09cc64cf3a0e596ca73991e9839
186 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 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.
  • 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://vilenefex.ru/strik?utm_term=500+spanish+verbs+for+dummies+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/nexoratuxi/egjigbb/piano_keyboard_notes_for_telugu_songs.pdfIn PDF document text
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/jedozukagiwaligejuf.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/ed152d79d3.pdfIn PDF document text
    • https://zovitixakozi.weebly.com/uploads/1/3/1/4/131483416/pajevupunatasukazeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_602a33b67df41.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/maguvu_xamazevok_tafuzikejozi_lujigevena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5fe95e75e245e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_605fa704f312f.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/4b49d2e29.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/tafawikabufaluzapav.pdfIn PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/e74cba73c42b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/qcfijjd/magagodipawas.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/dorebevebaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopagozijudiri.epizy.com/pafomel.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_a997f153635848988663f7d97c81b5b5.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_08acb03679e4435d9ef25b59ee1b98a1.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_fd6e3ec38bcd4a1182e6176af18294be.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_1e4560ba0cd64fa39d7a732d89665021.pdf?index=trueIn PDF document text
    • http://dakezemafatelo.epizy.com/69698325286.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_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 5744 bytes
SHA-256: fc948d634bf75169a1e587c317b85099aa84e52568dc4c6728dd7f7ee10d95a9
font_01_sfnt_off000130fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 11440 bytes
SHA-256: a9144b370e1b2b5e92531fb66b2e9bbda06d14251a52088158373693dbe0e007

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