Malicious PDF — malware analysis report

Static analysis result for SHA-256 47de8d73bf812846…

MALICIOUS

PDF

84.9 KB Created: 2020-11-25 07:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b8f3c63ce8d7b7be36a6bdc273567cca SHA-1: 4d3cb9a11aa5a99128df2c4a61f87bc70ab5136e SHA-256: 47de8d73bf812846c7ccdb1f0107ad212494166ba07cd7ddc6cadc2e85f2421c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://traffnew.ru/strik?utm_term=is+asta+a+demon+slayer', is flagged as malicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document. No scripts were extracted, but the structure and external links strongly suggest a malicious intent to redirect users to harmful content.

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://traffnew.ru/strik?utm_term=is+asta+a+demon+slayer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423195/normal_5f9b2c5c03a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fac07d9e453e.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/vevevoxonudariku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/ratawa.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/kixuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/jivopemutinikunasele.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/7300651605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e2d809-9226-4d7d-8d6d-042ec1b4459b/1037045491.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/fantasy_football_username_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b44a97-a7ae-429d-96cc-cc54a53e0104/will_vs_would_grammar_girl.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/62965924011.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 12056 bytes
SHA-256: 9ad98bc7a5dc3c7090f94c3958eed4f57d7f6e744ad7a7a5afb40270509d1a2e
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 5008 bytes
SHA-256: 29872552c0fac37d6fcac9f28b6cedd9537ebadf0b08378d591dcc18ba7e76a6
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 12504 bytes
SHA-256: 0139600938fc227296c2ec55e37c573cce6aa8761d2cd8d26955959e37704762

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