Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa725559b5e56c24…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 03:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae63df00703adf01890f9532d7083022 SHA-1: 11fc3e014a9281340f3433117cf4926643670417 SHA-256: aa725559b5e56c24e3912ad796dca5e53c156d52eb2606db29c0dbd98fa05fdc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=sole+e35+elliptical+dimensions PDF link annotation
    • https://cdn.sqhk.co/vomawoko/rYjeifG/144174431.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/cdKuOZF/how_to_apply_fill_color_in_word_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/GGgfXig/love_and_respect_dvd_and_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/SShihg8/75184549543.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/gX6jeih/ontological_and_epistemological_assumptions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_31e32f3f272b4964a3d6be6e8f523c3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zulezov/replay_ken_grimwood_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53aee627-d208-453d-a886-b3911ec3a5d9/how_do_you_adjust_the_temperature_on_a_norcold_rv_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690cf387-c6a2-457b-b679-281d3c0d2c9a/web_services_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/cinema_hd_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001717c1-22f1-4bb1-a741-17011a58e0d0/penorelumozujev.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_0b62fe6e2dca4fb5b2c8d72a1d410fce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/how_to_register_for_scouts.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_77ff2017755a4e46a8e2537b3870e597.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legesiliv/jozelexadojagebigewifibuv.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/gefuvalabetofipoj.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/togibubazigowubusoj.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/varibubopinafowej.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_7e9d6f227be546f0a9b5d097f3a48229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/208fac10-b71c-4884-84ad-f301b18e4e50/14868806867.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/hybrid_beamforming_massive_mimo.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/bonus_request_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/20724504988.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_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 5512 bytes
SHA-256: 3d6dd8daa1e005d070fd016e146f5683948fe89c923d7df0be97981217b374f4
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 10740 bytes
SHA-256: 274e0d1620a3e031c7849fbd7b702af4e8fbe6412b7a0f868999ac7cdca05a2a

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