Malicious PDF — malware analysis report

Static analysis result for SHA-256 656efff8b7283c50…

MALICIOUS

PDF

74.0 KB Created: 2020-12-18 17:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 00837f64d9b099e45df9209c2bcdec2c SHA-1: 102aa794a90c5d6bc4c5d91e1a9e6a6cce8fec6a SHA-256: 656efff8b7283c50d6d0b40476415644b68f01e3134bffa2d5837eb68d20c787
156 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 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 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.
  • 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=brad+yates+tapping+for+weight+loss PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f8cfa35ee3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5f8a1a8c04fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5f9b112d8f03d.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/pemirowegidegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5f97c1b38c5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fd98942ac8d9.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/pijurilixekax.pdfIn PDF document text
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/9840691.pdfIn PDF document text
    • https://luketekovagitor.weebly.com/uploads/1/3/4/2/134236109/dibixowiwane-zijefosupizali-jejodowin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f97a05d8737d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5f95a6d204d46.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/b3c9114f-aa4b-4e45-97ed-9fdc450fe657/mufobemanogomos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97483f15-a5b8-44ad-b64c-b361411dd6c7/jenefuvosijopadup.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/54069792137.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 5544 bytes
SHA-256: c5d20f74ce1acf0b1c22c3e982ec6d7457f335439706e144e8257240fbfc02a1
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 10932 bytes
SHA-256: fc5368ba3b0c54f5fb32ffd71da30c43a1c4d284a08b2efda16b16e2fed37836

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