Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a1c77f043a6cc2…

MALICIOUS

PDF

65.2 KB Created: 2020-12-11 04:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e31c957910623fca010e562f3645e091 SHA-1: 96eb1b04285b8712777c6659ecb9accd515eab64 SHA-256: d2a1c77f043a6cc256485c1f924c55c0a979fba67080321577dd89b3861c8bd2
164 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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=huckleberry+finn+audiobook+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5fd1a88ac362b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451750/normal_5fc993f82ca40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5f9ea5ff3fb00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5f9bd16550985.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/09236be306af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365653/normal_5fca8427dc47c.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/9aa2a7d5-b262-4de2-9f01-ce7e94ff2e53/calendario_200_dias.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6899cc6d96458364908ac/t/5fc76e5b56cd4459b3b8c602/1606905454009/92688183968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e6507f-3160-4131-9f17-987e81b797b0/572992453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ab4133-3f04-4105-83c2-6c2490245794/todunibitamijetivatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0fc46d-1d00-4071-8194-ed4a4ab27438/bawekalururezumetob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2681bb9-d4aa-4d26-93d1-53ad99155cbb/shopplaywin.com_monopoly_app.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_off0000c305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC305 5196 bytes
SHA-256: efae3c4a1d042408b3e02a6f4292f1c1f64a72bea6602553ce0e37942046197e
font_01_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 10224 bytes
SHA-256: b799089d5feaf9bf29327c1402ffbf9c4ab4b7f798957ee7aca4518b47876b80

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