Malicious PDF — malware analysis report

Static analysis result for SHA-256 1641a69a8b88cad2…

MALICIOUS

PDF

76.6 KB Created: 2021-06-11 01:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c2bdea40986bff9fc51de211b4a9f07 SHA-1: 71726c836b3e417292cdc2d38541bea9cdb21727 SHA-256: 1641a69a8b88cad2825b9df4e4d64eb35fec3a13346705dadb34ea9f75c4a57c
104 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, strongly indicating malicious intent. The presence of an embedded URI pointing to 'ketchas.ru' and a heuristic firing for a download button lure suggest the document is designed to trick users into downloading a payload. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/pbw?utm_term=traffic+racer+mod+money
    • https://cdn-cms.f-static.net/uploads/4500186/normal_605687d43cf5a.pdf
    • https://cdn-cms.f-static.net/uploads/4420250/normal_604d043dc753b.pdf
    • https://cdn-cms.f-static.net/uploads/4462982/normal_605c9401f2582.pdf
    • https://cdn-cms.f-static.net/uploads/4420454/normal_606da80b8c7fc.pdf
    • https://cdn-cms.f-static.net/uploads/4489716/normal_6056d0831e511.pdf
    • https://cdn-cms.f-static.net/uploads/4381978/normal_60287d450feb6.pdf
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5fdc639e621e5.pdf
    • https://static.s123-cdn-static-d.com/uploads/4391907/normal_60b325c1480b7.pdf
    • https://cdn-cms.f-static.net/uploads/4380707/normal_60152cec85737.pdf
    • https://static.s123-cdn-static.com/uploads/4392872/normal_5ffd4321c5e17.pdf
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5fecbc16e907d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://veposasidot.pbworks.com/w/file/fetch/145085700/13092342968.pdf
    • http://garifukedako.pbworks.com/w/file/fetch/144426753/what_ink_does_epson_artisan_1430_use.pdf
    • http://jebusolole.pbworks.com/f/9.snf_kuran_kerim_ders_kitab_cevaplar_ata_yaynclk.pdf
    • http://mawasuwov.pbworks.com/w/file/fetch/144973272/gusuvevukepoxibekujesa.pdf
    • https://uploads.strikinglycdn.com/files/c0357497-ef9e-41f4-97cb-42702f5b267e/what_are_the_different_types_of_nursing_diagnosis_according_to_nanda-i_select_all_that_apply.pdf
    • http://ritijix.pbworks.com/w/file/fetch/145088481/why_is_firestick_remote_not_working.pdf
    • https://uploads.strikinglycdn.com/files/f0de5ccd-7c2e-434d-bac6-e52b3b2c3d9c/how_to_get_really_good_at_bee_swarm_simulator.pdf
    • https://uploads.strikinglycdn.com/files/9f5fb492-3de2-4a4b-88fc-afb70c14b9c7/kofotirixal.pdf
    • https://uploads.strikinglycdn.com/files/4388e23d-dc41-4052-80a3-281f5b34f352/sharper_image_drone_dx-1_manual.pdf
    • http://vananizi.pbworks.com/w/file/fetch/144504537/what_is_the_maximum_income_to_qualify_for_pregnancy_medicaid_in_florida.pdf
    • http://jowukon.pbworks.com/w/file/fetch/144727173/8550897120.pdf
    • http://tosuvop.pbworks.com/f/free_gems_no_human_verification_brawl_stars.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f078.bin
bfb8c8c6c3f4c048b804c3365eeeae37cde7f8cacb7897a15aa3b9c0ffd0ec87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5008 bytes
font_01_sfnt_off00010174.bin
860ecfe24b8f0ad99f8abe7debba8dd726496c39a24bbf6e92d52f06a830b210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10452 bytes

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