Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c88e42260ba7a8…

MALICIOUS

PDF

72.4 KB Created: 2020-12-20 16:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 491fc389a2a76c3b532445afb3ce9646 SHA-1: a24d0ef9f6202768f62dbd523505443c9e9984b6 SHA-256: a8c88e42260ba7a8ecb6d323b757c1380bbd1695c27ec96ff52ff9ecd1244e92
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 flagged by ClamAV as a phishing trojan and by an ML classifier. It contains an embedded URL pointing to 'trafffi.ru', which is likely part of a phishing campaign. The PDF structure and metadata suggest it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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/strik?utm_term=george+wright+loan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd163ac3c104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f9f74ae43b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f9a6a5b935b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f92ccfb27900.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/fasomusogapovi/86556650367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3943da-20b5-4872-810f-bac913d8672c/18292377791.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/the_rainbow_fish_song.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/binance_ios_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd28e788390d34f381f39e/t/5fddce05463d3b6c6f25a022/1608371718400/93874230229.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/83254180047.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/66008925726.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2945e27a199023ac02054/t/5fccd922978da30c56fc6928/1607260452031/best_defence_academy_in_jaipur.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/49640119265.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/94243953085.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/67982499984.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 4892 bytes
SHA-256: 080701dc61c2a0957f7a9cb22dbd117936674d50f5c18f5997b9be1c9065db51
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 11216 bytes
SHA-256: aa19bad3b0dfa86b1109dfed4759c9b9dd8673760ea54010aa398037d656b161
font_02_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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