Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd3cfb04fe53824…

MALICIOUS

PDF

91.4 KB Created: 2021-04-16 02:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 150ba16ded585882042790c3db5f5f31 SHA-1: cdc571b0ab8ee52afaa77af95c50996fa3e67e8c SHA-256: dfd3cfb04fe53824f971458f13a2a35545f365efc7d23171db2164ec90d9504e
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 0.9997

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://jacksth.ru/strik?utm_term=kenmore+electric+range+model+c970+parts+canada PDF link annotation
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/dijimu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_5ff667cd05a7e.pdfIn PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/4779672.pdfIn PDF document text
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/c627bd98581ff.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/mozaxususexava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fd08f62d87ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_6036d9d81654c.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/juzinaramip/decision_tree_analysis_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3acb7c-7c18-4a77-bcfb-aebe3e8de1d5/mr_coffee_iced_coffee_maker_how_it_works.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/speed_and_acceleration_calculations_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/56537709771.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/new_moon_in_sagittarius_intentions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3908cee2-e092-47b9-bde8-a6b38b10863f/14718953186.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/long_island_railroad_schedule_ronkonkoma_branch.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/amma_images_hd_wallpapers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22453bb1-8cb6-49b4-b069-53eab4b90766/cfop_method_pll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef321a0-1da9-4d4e-adb8-e5e5b3438a3b/talk_to_me_in_korean_level_1_google_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/update_android_xiaomi_redmi_5_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a787d7a-a5a6-4dc4-943b-afd76e294438/zoom_g1x4_firmware_update.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000147de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x147DE 16888 bytes
SHA-256: 52c9adcca337f49898927ccc1d058a0d959a80d690cbc3b991a60681df79fa66
font_00_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 5740 bytes
SHA-256: c93ae98d22321cca0b60c3f1f6eee0338f8842e4f922faa602c3e96c5b57df0e
font_01_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 12596 bytes
SHA-256: eb7c3297fdc3d9621094d373fcfdc1226badd271feede5c9ca020b91172dd423

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