Malicious PDF — malware analysis report

Static analysis result for SHA-256 624528f7f6960226…

MALICIOUS

PDF

78.4 KB Created: 2021-04-06 02:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20c124605f2d0800056835e70f96729f SHA-1: ca1f35caacb318bc8b1a2fc7c9cb9c402f7dbc9b SHA-256: 624528f7f6960226a073b4a9b44bf450fe8fd28a56dfff8c6afa66c65ad08523
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the use of an image lure linking to an SEO redirector, specifically disguised as a free download for 'copperplate calligraphy workbook pdf'. The primary malicious URL identified is https://zajinet.ru/award?keyword=copperplate+calligraphy+workbook+pdf, which is likely used to deliver a secondary payload or conduct phishing. No scripts were extracted, but the PDF structure and URL suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/award?keyword=copperplate+calligraphy+workbook+pdf PDF link annotation
    • http://sarkife.site/go_math_3rd_grade_homework_answerupwjw.pdfIn PDF document text
    • http://ceter.xyz/marlin_336_scope_base_screw_sizev99jn.pdfIn PDF document text
    • http://fasad-dom.site/653844657979ofte.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/online_convert_blob_to.pdfIn PDF document text
    • http://reduslim-officialsite.site/the_hobbit_book_sizemodvs.pdfIn PDF document text
    • http://new-leggins.site/birufurasewazoruzx9hd8.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/zurovajij/xowagazirojojopa.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/changing_degrees_to_radians_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/colligative_property_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3c0910-31eb-47db-a5d3-d7052e93eaee/physical_science_grade_10_past_question_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e100e6-f3f6-4717-ae58-9acf05f9f449/how_do_u_play_chicken_foot_dominoes.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/13553789037.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/maniacs_2001_full_movie.pdfIn PDF document text
    • http://kopolug.myartsonline.com/ml_a_pulgadas_cubicas.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/60900666674.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/66393230249.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/kuvisewerote.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 5544 bytes
SHA-256: 5b0aba196ad46c96ad29a9a5014de542a52cd8feb8f062b2fd24bf65e3bdcf63
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 11144 bytes
SHA-256: dd7eada3f7d792c382cc9c9a2ad72ab6e1fbcf1e1b4d84bbd38039900b984fbe

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