Malicious PDF — malware analysis report

Static analysis result for SHA-256 525921a6e9ceb2af…

MALICIOUS

PDF

68.2 KB Created: 2021-03-13 19:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6dd9a51ebeb3154f33cd7e55b448573 SHA-1: 740fc7faea867b698c7b04df8fb05929e4d85bd6 SHA-256: 525921a6e9ceb2af0ff5bd63bc59d40573f6ebbe6ee2e55159939209b48924f2
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 0.9998

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
  • 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://zajinet.ru/wix?keyword=prince+of+peace+baptist+church+detroit+mi PDF link annotation
    • https://cdn.sqhk.co/furafurume/hcXiagc/vonodogakuvozukonex.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/gwihihB/affirmation_definition_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/hjgihiw/grass_cutter_service_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rafivomew/hhdOjgk/maths_questions_and_answers_for_competitive_exams.pdfIn PDF document text
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/dumasaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/hiihNif/prince_dress_up.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/3e178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6dd6dd-282f-4d4e-82dc-308c6a164332/minn_kota_ultrex_for_sale_craigslist.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/belkin_n150_wireless_usb_adapter_manual.pdfIn PDF document text
    • http://pipikujawi.rf.gd/jafiletibazikinuro.pdfIn PDF document text
    • http://kafuxipadirates.rf.gd/nigamanuwukenidemusu.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/central_govt_employees_news_da_calculation_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b48b8eb-b89a-441c-963f-156d357a8fd4/how_to_write_a_memo_to_the_board_of_directors.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/7359571824.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/30692759066.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/thule_roof_bike_rack_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b03a23c-4a0b-44a1-8c35-057da8ec31ed/what_language_did_mary_queen_of_scots_speak.pdfIn PDF document text
    • http://dugafoto.epizy.com/echo_show_2nd_generation_help.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/wedding_budget_calculator_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/yesterday_weather_report_in_india.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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 5504 bytes
SHA-256: 8a28521fe59388f26eb768cba6831284f10e3a23a358e2ee46b3457d6e2c3715
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10452 bytes
SHA-256: de248e6afcff4bd86918f198f6a12ae80362420f3722e2df410e432f507852c8

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