Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4580b330e8370c0…

MALICIOUS

PDF

69.0 KB Created: 2021-04-06 12:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e6b864d424804509cd1f85e5437711b4 SHA-1: 69a7550cbc48f9033e98bb4f73c19013e99490e5 SHA-256: c4580b330e8370c0ef2b25a9ab48b99a56080012b81744a54c351811af0812fd
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to free PDF downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=medical+virology+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388611/normal_602d9308c34fc.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/ijhthht/26478771523.pdfIn PDF document text
    • https://cdn.sqhk.co/barevirus/2ssjaOD/lopasumutafelejazas.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/Ajcjhid/discount_code_for_groupon_new_customers.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/jjqwKig/terra_mystica_mini_expansion_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/haaSzt9/wifi_barcode_scanner_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6044fc5b2c31d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_6061cb44dfb88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482869/normal_603fc1e795625.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/f9e66d6e-5139-4512-9ec5-d1f615936b92/hp_pavilion_g6_motherboard_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0be461-48db-47ae-b066-8cf43e912069/diary_of_a_wimpy_kid_box_of_books_1-14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ada1271-5710-414a-b224-f54ba034e8e2/gavel_toastmasters_club_bangalore.pdfIn PDF document text
    • http://remigesej.epizy.com/facebook_video_calling_plugin_for_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/how_to_change_battery_in_ww_scale.pdfIn PDF document text
    • http://gumotux.rf.gd/2007_chevy_impala_ls_tire_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74697170-f668-4b8f-a624-e46f46f64313/can_i_exercise_if_i_have_scoliosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de0ee9a-1141-4b48-96d0-aadca0f9f7ea/how_much_does_a_mercedes_smart_car_cost.pdfIn PDF document text
    • http://toraxetutat.epizy.com/63063106853.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/axonal_polyneuropathy.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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 5404 bytes
SHA-256: e9b563856f5760efb5486be11831217cc61418c0027836a22711de98d946578b
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 9644 bytes
SHA-256: 1d9fd5c14e5b1162264f9630661f5c95f5ec0afa91650d56a0a6af8df85f92de

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