Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c31c171ed5335ec…

MALICIOUS

PDF

91.6 KB Created: 2021-05-15 06:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19c9e2405f5948fd998ad5ffeccd6127 SHA-1: 21b51d84c430d800e3512a09adbd69f9a16b1f19 SHA-256: 7c31c171ed5335ec6a2c4f33606facb1f5aa2f4dfede7ed20e70550eaef41c91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://xajibur.ru/strik?utm_term=betty+crocker+classic+carrot+cake+recipe', is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://xajibur.ru/strik?utm_term=betty+crocker+classic+carrot+cake+recipe PDF link annotation
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/5737551.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/lightroom_mobile_presets_free_zip.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/4512169.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/kuvisodumafug_vubovazadex_gasubapezeb_xidigataw.pdfIn PDF document text
    • http://alisabor.design/business_law_text_and_cases_14th_edition_download_free7np8h.pdfIn PDF document text
    • http://reduslimitaly-official.site/ninja_blender_bl610_attachmentsithy1.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/futamo/rosibujerozagarixelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/how_to_write_a_body_paragraph_ppt.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_0f595e0e838943cc9737fe1604500b42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/igcse_edexcel_biology_revision_notes.pdfIn PDF document text
    • http://panafinuniro.epizy.com/dichiarazione_di_conformit_urbanistica_compravendita.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_c58a9f9863144c1dba554d7a98ae494b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/denali_care_income_guidelines_2017.pdfIn PDF document text
    • http://babivukir.epizy.com/geometry_writing_equations_of_lines_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/12406918579.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_173298761f1147d3a999eade1bf40913.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/english_alphabet_song_free.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_dd9152906e5442d19edd23c85cd1f655.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/will_there_be_more_percy_jackson_books_after_heroes_of_olympus.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/zurizilexatabinowawawavov.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_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 5144 bytes
SHA-256: 313200cb0f1957eedd5b3d59e0b5c150dc54bec94110b6facdd7507a7ac42351
font_01_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 13124 bytes
SHA-256: ab28b341cb26587bad56b044e6b0e8c458e669800d617b17b5faeedd75158f7e

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