Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde3a2b95fccddaf…

MALICIOUS

PDF

70.3 KB Created: 2021-02-18 00:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a54da986664b70c1b10d7feab04477f6 SHA-1: d46146ff2b9fa0981876ddd66eb9ac38a4ebb657 SHA-256: cde3a2b95fccddaf5ccd2d224985396e75d71d40015989c941924217bcd91370
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://jacksth.ru/123?utm_term=little+girl+1st+birthday+poems PDF link annotation
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/tazerafo_leraravalobisu_muliz_bubofigapezavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fd65bc2ee08e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_602a286e678cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_601af53b9e078.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/nhHjiV6/90500412860.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/4127981.pdfIn PDF document text
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/89075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fe4c995c13f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ff7591b26591.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/b99dc79.pdfIn PDF document text
    • http://lidzadva.xyz/arielle_kurzweil_reviewsf5aan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_601fb11f8376a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_6019ab5674702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fd628faf2c89.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/hhhdgBi/xfinity_prepaid_free_refill_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_6022ccefe2a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd67c2d10eb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 5608 bytes
SHA-256: bf54d2e38ae5cdf3ded2b0b1c061fb6df7d67fda863f98b20d6baba9b0a7e1d7
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 10860 bytes
SHA-256: a21a89f71467210bcf5c81bce1dca7e9d60a7b219ee904509b363cb5ff34e278

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