Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b37808ba1d4355f…

MALICIOUS

PDF

61.4 KB Created: 2020-12-22 05:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f8ce4c22f5723bad1768a9ea33b3629b SHA-1: 983341219d15bf94642a3b36e046f8a984c2f1f2 SHA-256: 0b37808ba1d4355fa1c986571cec863bb1349d5301def06468655053b1dcce2a
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 0.9996

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://trafficel.ru/strik?utm_term=twist+together+crossword+puzzle PDF link annotation
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/5753841.pdfIn PDF document text
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/dejawufevabunik-meturet-jelubovenuritim-gilixutofog.pdfIn PDF document text
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/804b01.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/dukegajipijotixop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5f96cdc0cf140.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/kifodadonopibonufif.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/dozojed.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/xodisidezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f91054c4fd06.pdfIn PDF document text
    • https://gotivewa.weebly.com/uploads/1/3/1/0/131070711/wimexuwuwizasiti.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/zerejibixupav/22018431636.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/el_fiscal_augusto_roa_bastos_descargar.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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 5216 bytes
SHA-256: bda3acc0df8eaa71b8d8242b33f1e2371cdd9f0992bb8b2e8c9a660d13983cc4
font_01_sfnt_off0000c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 10152 bytes
SHA-256: 5c9662e44eea3c5d3c942674b005b7f6073a33dc9855f5a5595f3d9305a26352

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