Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b2cfe59cc0a883…

MALICIOUS

PDF

87.4 KB Created: 2020-12-19 12:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e68b43426489f508502273c668c1d3cf SHA-1: e0f0037c20ff0bd7bce6d7f1d809c12876f6f875 SHA-256: 23b2cfe59cc0a883e210fb8bb84c1c14b92dca219e8c516b77cb99e9dd60dc0a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used in SEO link farms to distribute malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The embedded URL points to a domain associated with phishing, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=sony+tv+schematic+diagram+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8cadc3a6778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fcd9e07487f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463526/normal_5fa890d68eb9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fbd96657c8bc.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/pudavawil.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/rosamogatexanutedub.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/108060b8-41e5-492f-a27b-5de0fddc1207/sugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdefc2b-bb19-47ea-ac7e-0ba75c9f0381/35420024487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f2de5c-a9d9-4007-8834-415b178c220a/kaxepixibufazuratexo.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/blackjack_card_counting_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/73028043904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d296dc-fa1c-4a82-a26f-ab426f69661e/fundamentals_of_financial_management_concise_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74917ba2-4319-4720-bb56-2cecb2f3d56f/19651971617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36989775-2e11-447e-877c-7478ccc38e03/rawiworakunuputatiposot.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_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 5792 bytes
SHA-256: 57eac4fe03aa1422a90c27076b4347939d95f9362dbbe34d03de24d01b9de58e
font_01_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 14764 bytes
SHA-256: 293676066b77dc048d98bd95347fe331aa55cf964b2766c7767d47868dbecaf2

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