Malicious PDF — malware analysis report

Static analysis result for SHA-256 5443a1255cf2d2f2…

MALICIOUS

PDF

72.4 KB Created: 2020-12-24 06:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1f5e6d95ef149ef6d241955ad44e987e SHA-1: 9677f3ef4210d85fd9b42047fbe9bcffb904123f SHA-256: 5443a1255cf2d2f2edfa5f0eb29c2be38f2ddfd9f9d887ba9d16303250f355ad
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link to a known malicious redirector, cctraff.ru, which is likely used to serve a second-stage payload. The presence of a 'download button' heuristic further suggests a social engineering lure to trick the user into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=tecknet+mouse+driver+bm308 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fa25838ce43e.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/cc658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417329/normal_5fe0f8aa6f44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5faf2bac17f09.pdfIn PDF document text
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/vajuvaximaxa_maroxo.pdfIn PDF document text
    • https://cdn.sqhk.co/javejako/gh2TRhf/xabosuge.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/gcGAghy/67698067923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5faa133ce44f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f92d228b3939.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/tiduxufadabek-nuwojekabirexol.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
    • 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_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 5440 bytes
SHA-256: 2a1f06236749f1257caff60f2149cfbd52c8e919fc803ad622238b8663eccf1b
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 10580 bytes
SHA-256: 91d620237e58e37b1ac85666da36973968cf20a6128e8dd6344b8eab98639edd
font_02_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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