Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8c88d9b89810d7…

MALICIOUS

PDF

73.8 KB Created: 2021-01-12 12:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a9a61cba1e0954c6054183304bc522c SHA-1: 452b490304e4c268f312cde68ed28b7a1d47b8eb SHA-256: 4f8c88d9b89810d7ff7c3befb9feb9e5f868c3e3969de6e29dcd9df7b8ddd3bc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded external URI pointing to 'trafffi.ru', which is likely used for phishing or to download a secondary payload. The presence of PDF-specific heuristics and numerous embedded URLs further supports its classification as a malicious document.

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://trafffi.ru/aws?utm_term=passive+causative+form+of+the+verb PDF link annotation
    • https://cdn.sqhk.co/silakozafi/h7wdjaY/14245391302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449984/normal_5fe0fb0f19585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8720a992d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_5fe7a2be2b964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fc8cf2cd854e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5fdf147e2b3c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5fa0cc43712df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_5fd8538895304.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/eZ4jjgl/final_fantasy_7_remake_walkthrough_gamefaqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5faecc5ec907f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373016/normal_5ff5874b1e574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fc055b755fb0.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/hhjh1t6/gogulaxamojovizoriwi.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/2nI4ohd/39688767512.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/rawesaragegugar/73048439528.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/how_to_create_excel_tally_sheet.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5288 bytes
SHA-256: b52b22df75fa5e061f1935c3a689ae7f6393ce16870bb91b502c44d8240fc550
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 11688 bytes
SHA-256: e8d09b25763eb115451c6fed2e6e0ebd1336ffd89ba3927fa3f1f75d707baf80

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