Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb2c8487137974e…

MALICIOUS

PDF

89.7 KB Created: 2020-12-15 21:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d28f32a383ff1e1607c978bf18bc7d5f SHA-1: 2231df5e70534f0434c2ce5016f882cb45867289 SHA-256: 1fb2c8487137974e306c5cdcd6a6ca1c2189d6657ddbbda4ce1c4255bcc4cfa4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a phishing lure for browser updates. The embedded URL points to a suspicious domain, likely serving a malicious payload or redirecting to a phishing site. While no scripts were directly extracted, the nature of the lure suggests an attempt to execute further malicious code, potentially via embedded JavaScript or by tricking the user into downloading and running a secondary exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafftec.ru/strik?utm_term=sony+xbr75x910c+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460042/normal_5fcd7d6df1665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fbee11e35c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_5faf279dbaa6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5fc65eb93f0fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fabcf6a-27fb-4429-a3ce-12d2bb2eb6ea/book_of_spells_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc567426b97992eb579db2d/t/5fc71a9009f4d56e8f7df390/1606883985435/pixel_survival_2_damage_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63131264-7344-4dab-9e7a-011249ed5a6b/saglamindir_gta_san_andreas.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/algorithm_and_flowchart_questions_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54a213398ff75154ad2d0/t/5fc83748e21c7c679adb79e8/1606956872137/hexagon_board_game_table.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2923b7848ba205d233c3f/t/5fca73315846d15d25f47e8f/1607103282301/center_of_gravity_chemistry_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f22da6f-ef90-4b9b-a8e1-64783ef626af/98684975053.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc659b6116eb00e3c713032/t/5fcfcc1d3166556743ac785e/1607453732725/our_solar_system_is_located_in_what_galaxy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd8c9a2-a2ac-4c11-9d0a-2614c8eeeae1/rawoferamitovurofazute.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14f89d26ff1194f767fe5/t/5fccf47705ddc9599d2341bb/1607267448188/fobokoxenibozawalawada.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_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 5732 bytes
SHA-256: 3c9cc97381b688d7ff223e7d84207bc21398ad7e50bba4fc6f2ff6d30b09ed0a
font_01_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 11312 bytes
SHA-256: 3372cd67025a39cbfd1b790212d1935c0fc3d6a8b82beb92b2f2cc946dcf45a1

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