Malicious PDF — malware analysis report

Static analysis result for SHA-256 be72e07791f065c3…

MALICIOUS

PDF

82.4 KB Created: 2021-06-02 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b132e924150aa49d2e31fad6a25e7a88 SHA-1: e2f320d859adc57f0f8ebe87283518f5647186f2 SHA-256: be72e07791f065c363da0415c45737eb017a453640368c2827294453bf11f046
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/123?utm_term=video+editing+course+syllabus+pdf PDF link annotation
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/4628406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_603935491d8c5.pdfIn PDF document text
    • https://fosapiluni.weebly.com/uploads/1/3/4/6/134653401/siguxuginaf.pdfIn PDF document text
    • https://sagolofuba.weebly.com/uploads/1/3/4/8/134873879/4746922.pdfIn PDF document text
    • https://vomadepuxu.weebly.com/uploads/1/3/4/7/134700608/jabagijawar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5ff91ff01ea0a.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/762b338b3c7.pdfIn PDF document text
    • https://zumikefu.weebly.com/uploads/1/3/4/8/134886628/3a1f4e770.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/6782870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5ff26141f38f8.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/5147766.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/vukisapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc95b7b2-1621-42fe-b5aa-7feb065311a4/33736153140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3de7e14-57ba-4dc7-bca8-9a5b1b36c1c0/50695853786.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 5528 bytes
SHA-256: db0c1ea4a2374e0ce7104c40b126248b7b0ff2836b1de93c363517972fc695cd
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 11500 bytes
SHA-256: bf29bf47958bf2e6a95b38aac0bc8b3e0cccf77903d4a1c3f7707fb0fa81ba7d
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16232 bytes
SHA-256: 518caaef23ff38dffd173390deb2ebbf4fc7588f1930709da0bf1b0df588cfea

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