Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56d87bd36366fc8…

MALICIOUS

PDF

73.4 KB Created: 2021-02-16 19:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 594c6e04734dd9b7508c54c54da5cb66 SHA-1: d5b47ca2ed7027888e32908ef6abcecf23511141 SHA-256: e56d87bd36366fc864ec4f242c4c658f5c6fb7d2ad13d1b2217d835f4a122da7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=unit+2+worksheet+2+chemistry+answers PDF link annotation
    • http://gijipodotetojo.22web.org/android_studio_theme._appcompat._light._noactionbar.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/2845541.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/8485000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600a9ddaa9ce9.pdfIn PDF document text
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/7847410.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/2dece1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492555/normal_600274470a292.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hghnhdh/disulelaruk.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/buidghs/14448795402.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/kijelopazekune/transformers_optimus_prime_studio_series_5.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/5005709164.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/17464624832.pdfIn PDF document text
    • http://diwevobu.rf.gd/ajax_post_file_response.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/meeting_minutes_template_for_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/forming_abstract_nouns_worksheet.pdfIn PDF document text
    • http://jiresigotapikeb.rf.gd/27972752399.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5388 bytes
SHA-256: c3911a4fc53d225d9ccefa401bdc8ac79650798b87bdc77a98049e316b9d0c1a
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 9948 bytes
SHA-256: 3303d4ae4fe9664bae277569a4b5d65592ac961e417ab83adb47c9ab8769c9f3

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