Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee61f08dd64f500…

MALICIOUS

PDF

81.6 KB Created: 2021-05-25 13:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9778761c6158c4f2f1303006f87b5b6f SHA-1: 30cbf456dd4855e8b766d8c6928653a2605e3cdd SHA-256: 3ee61f08dd64f5007d13c7d32a2628082596aa9f3ecd380e8f032d1502fbab00
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'auto clicker' and 'ios 13', likely a lure to encourage interaction with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/strik?utm_term=how+to+get+an+auto+clicker+on+iphone+ios+13 In PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/0be24307a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_602750674ac1a.pdfIn PDF document text
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/7872385.pdfIn PDF document text
    • https://rarakini.weebly.com/uploads/1/3/4/8/134884681/8953811.pdfIn PDF document text
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/bugikatoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_60413de09e738.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/7571643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/960f5c71-c92b-4a66-a820-65cf76dba852/how_do_i_reset_my_binatone_cordless_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/past_due_account_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/un_fact_finding_mission_myanmar_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/poe_betrayal_build_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/best_reloading_manual_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3c6c68-4b24-430b-8fc6-f48bc3697bd7/41797546201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f74281b-67d0-4ee8-a025-3d746a8b7d1b/95554895495.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/mikinosunom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce21726-0cec-456f-8325-1fd19632a9f5/how_to_attach_hose_to_hoover_smartwash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411dada5-6506-4bf5-a6ae-3ae29710b992/how_to_change_afterglow_controller_color_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/al_quran_software_dawateislami.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/bloodborne_ps4_trophies_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1548f0d2-5f7d-4d98-9855-cd5669bc92fc/rabuxediva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c05a10c-70fd-4f7c-85a9-394cf340e617/33718157072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fb73d3-3308-46d6-876c-fe5074dc56cc/juzekelajazelujedorel.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/is_echo_dot_3rd_gen_better_than_2nd_gen.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/timaxemisugo.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_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 5408 bytes
SHA-256: 182c32f49bf9adedc9a15da2463504ef709fb4c4717f4af0daf5b49266648114
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 11372 bytes
SHA-256: e2d99ed594f4ed1cd6ef60a64acc690f34e2fdca43721a5ddbb295ce3aa780ac
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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