Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ab716c1e66bd77…

MALICIOUS

PDF

67.3 KB Created: 2021-01-20 12:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 745c78b294f7c815039c08e7ca0d4360 SHA-1: 7c79468401d74205a4c761b343370415ec028b5d SHA-256: 48ab716c1e66bd773425c153f7299df5fa40cbe4d32fe58100d4523a15250b85
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attack pattern focused on luring users to potentially harmful websites.

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
  • 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://leonvi.ru/123?utm_term=chapter+27+light+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368978/normal_60079c24ea9d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_600446912c16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8735d9cef99.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/7bb2d27a965f20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366331/normal_5fee1642629f6.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/iauxhmd/disney_battle_heroes_tier_list_august_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fad55f343b4a.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/uhjhjif/word_pets_free_word_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401558/normal_5fcaf32f35807.pdfIn PDF document text
    • https://site-1176699.mozfiles.com/files/1176699/gawuzotuve.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/gXha2jb/bike_racing_game_free_download_for_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_6006fbb291101.pdfIn PDF document text
    • https://site-1176791.mozfiles.com/files/1176791/98190828520.pdfIn PDF document text
    • https://site-1176433.mozfiles.com/files/1176433/49359024801.pdfIn PDF document text
    • https://site-1200839.mozfiles.com/files/1200839/appradiolive_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/TibhckE/sofosojadomuwa.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_off0000bd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD56 5084 bytes
SHA-256: 97b778c0b5b947b83de4e71bc37fe100d05bfe02490ff5d72f774cd1462efdb5
font_01_sfnt_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 10452 bytes
SHA-256: a3177eae7438837ccb5a54ed21315e8afcdd895ec8d85c25714a094b82bc7e26
font_02_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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