Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd65518a587f3a5a…

MALICIOUS

PDF

73.3 KB Created: 2021-05-19 19:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0386b4620a612686d5e0264b1b39ec09 SHA-1: 92e67de62c87980a5d2196a813bf85b492568fdf SHA-256: dd65518a587f3a5a1c7f9d89d3d8622cbcf648b9d60e5701d997acca40f4078d
156 Risk Score

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. The presence of a "PDF_SEO_LINK_FARM" heuristic firing suggests the document contains a large number of external links, with one prominent example being https://s3.amazonaws.com/tokit/bal_ganesh_songs_free.pdf. Another extracted URL, https://seumenha.ru/wb?keyword=how%20to%20hard%20reset%20jetpack%20mifi, also points to a suspicious external resource. The document body is heavily obfuscated, but the overall structure and heuristics point towards a phishing or SEO manipulation scheme.

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://seumenha.ru/wb?keyword=how%20to%20hard%20reset%20jetpack%20mifi PDF link annotation
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/72a050be47884.pdfIn PDF document text
    • https://lasirobazu.weebly.com/uploads/1/3/4/3/134399905/dudewotu.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/raxagovod.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/tokit/bal_ganesh_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/how_to_be_a_bawse_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/how_to_learn_computer_programming_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2096b6-6ade-4f2f-b8ac-8b40387f8153/harry_potter_read_aloud_book_1_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aeaa4ea-3c46-4237-8cf1-87caa38af775/is_chai_tea_good_for_your_heart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48a7bad-bdc6-485c-bf09-09d80d40fcb9/zojek.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/limofabi.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/nice_guidelines_ruptured_ectopic_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2864aef5-46f3-43ba-a392-96e1d3160f53/derechos_humanos_en_ingles_como_se_escribe.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/mupunejogigejufel.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/how_do_i_remove_drm_from_kindle_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e856fc7-9b5f-4329-bcd9-44117e5b88c3/57033838264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43255698-975c-4de4-96d7-c44674bbaccf/mewurupopubazemozajub.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/biogeochemical_cycles_foldable_answer_key.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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 5556 bytes
SHA-256: 7618d07d65a6df08203c0d535abc597cc2df437e495067e20f36f05b98c5a898
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10328 bytes
SHA-256: a0db94ae3839f9d51d7e52fbc7d434666f79fe03027bab1a24526481b560efd5

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