Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6ce8fe9b9560d6…

MALICIOUS

PDF

76.1 KB Created: 2021-01-12 18:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d2884fc4d49359bab1a944cc7b219119 SHA-1: dc71aed0b612cc44ff2159a61e1853b2ed6355c5 SHA-256: 3b6ce8fe9b9560d68e827dbdee3a8041ab040431a2517cc47c35947c203b85f1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, indicates an attempt to disguise the malicious nature by presenting itself as a search result for a popular software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=nes+emulator+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451549/normal_5fda5700b3e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_5fd2559e23844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450417/normal_5fd9f5a308704.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/nEhjoor/81993199442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5fc552259c0ab.pdfIn PDF document text
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/kidaxozunedutorodod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_5fae392ad5129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe4d507630da.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/WzcDghT/microsoft_onedrive_startup_impact_high.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/vanipo_xozaforas.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/sjghaii/luxury_daily_deals._shopping_app_brands_stores._com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fd74f00c4933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kokesatodixon/xubajivoxapifoxipiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/47072262901.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 4728 bytes
SHA-256: 4f7b80e759d57e815a776f50660f144bb6d74b5ed1a9c9b68a6256733af830d9
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10804 bytes
SHA-256: e49db85305278c80549fa808b41e158242cb5e30795a254740eb6be169599806
font_02_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16328 bytes
SHA-256: 186a900da6afcb7aef2fb86232bb8d0a752d14b082ed4aa21bfde03ab2c935ab
font_03_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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