Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b5694576b5f3cb…

MALICIOUS

PDF

70.6 KB Created: 2020-11-20 17:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9cd086bc3b44db3a357efa3f97786a9f SHA-1: 900af49180245be0551f27e9ee5fe1ddc55818dd SHA-256: 27b5694576b5f3cbf537f926160044229f62239cc8a64eeefc2ff4b969d7d274
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains an embedded URL pointing to 'traffine.ru' which is presented as a download for 'Clash of clans game free download apk'. This suggests a phishing or social engineering attack aiming to trick users into downloading malware disguised as a game. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=clash+of+clans+game+free+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422163/normal_5fa060435289e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fb2dbca65afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f93508946bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f990be585c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f893d7eaa9ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f91934bd7a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_5faabfd785b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f8fd98e9159b.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/fokapikow/nuwodezuran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97aab4e5-a5ea-45bd-8fea-09a34c82e029/52867146004.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/pifowax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49daf3fa-ddd7-4be4-8a7b-e032339eb795/90586090564.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/79087172244.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/nfl_pro_reference_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/black_knight_pinball_for_sale.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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 5632 bytes
SHA-256: 527288b66423df4207c96b76746bfc42e6782545e769429758d1b7999ceb3af0
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 10584 bytes
SHA-256: 0b39d1f710b590e96af05e2ffdcceb3528f166b0924c891d6dbffc6666387b2c

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