Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac546ed59f490c1…

MALICIOUS

PDF

130.1 KB Created: 2021-03-19 16:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9cfc3947ec477dd3a85cf93d60d973cd SHA-1: 60991800c0712fdfc09c5720e6dfbd0af88dec8c SHA-256: eac546ed59f490c1cfc5c765f2c8e358d5fa2be02918300b6cb492b80f24ed83
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is designed to lead users to further malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL indicates an attempt to deliver a payload or phish the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/award?keyword=advanced+life+support+manual+7th+edition+pdf In PDF document text
    • https://cdn.sqhk.co/nugizape/hgffOjC/lip_liner_tattoo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5ff97bffb3436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60356e1a29a94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5ff2c6648551f.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/jRggjbu/pefitufedebofagomozi.pdfIn PDF document text
    • http://filmera.ru/buccal_route_of_drug_administrationnrxq9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_601a800894f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/nowegizin/Xhjiai8/kuleb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fecbfc0a8642.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/hjeDK87/chapters_interactive_stories_promo_code.pdfIn PDF document text
    • http://gazzsheff.xyz/ruvoxoxosegulasumen9scaw.pdfIn PDF document text
    • http://biomanua.website/823804729614f63f.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/iSgiZic/rebiwalolejenogolubosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458635/normal_5fcda91dc231f.pdfIn PDF document text
    • http://francobusiness.com/rabbit_population_in_australia6zp77.pdfIn PDF document text
    • http://goproonly.com/tatanujutaditumebukelovaguug28.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/status_songs_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/employee_medical_check_up_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/81705008977.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/english_riddles_with_answers_for_college_students.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/business_appreciation_letter_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/what_is_experience-dependent_brain_growth.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/quartz_composer_sierra.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/48480997351.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/why_does_my_id_say_not_for_real_id_purposes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B53C 1872 bytes
SHA-256: 9fba9b0d9e2cc48f58c52755440c9a9bb3bd4c5dbe3d8c853d7e81cca7fbdf20
font_01_sfnt_off0001be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE31 5524 bytes
SHA-256: 2489aca7fcd54aaa07e46bcd5bc42f55703e19d15986645cc2e1b432d6499be7
font_02_sfnt_off0001d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0DF 11976 bytes
SHA-256: fa1a1998180206b7307a503331d72d40347c09642ddd0c8c824ec5f4f31fa6d0

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