Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a3d0ff1fc49939…

MALICIOUS

PDF

75.1 KB Created: 2021-06-01 09:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9e6a1009a8c63576c94035577f2c09 SHA-1: 139dc02a345e6acddd9199ca20c16fd1d2276833 SHA-256: 80a3d0ff1fc49939899e38f5ee4bc2b650b380e0153d58448b6b8bf6aabb683e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URI points to a suspicious domain, ketchas.ru, which is likely used to host a phishing page or distribute further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, consistent with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/pbw?utm_term=should+the+electoral+college+be+abolished+dbq
    • https://cdn-cms.f-static.net/uploads/4388062/normal_603999b7c5db3.pdf
    • https://static.s123-cdn-static.com/uploads/4460071/normal_5fccc4f5dbdd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d79823f9-d224-4bb2-bc25-ff2da4edea37/fakalirajabafun.pdf
    • https://uploads.strikinglycdn.com/files/75b6b1be-465c-430a-80f3-b6686bf683e1/16209597741.pdf
    • https://uploads.strikinglycdn.com/files/66314427-2759-45b7-a7a9-9be465b18ee3/18393261465.pdf
    • https://uploads.strikinglycdn.com/files/ab1fb208-12bf-45d1-9b1c-edb15aeb68ed/how_long_does_it_take_to_read_korean.pdf
    • https://uploads.strikinglycdn.com/files/6e430a14-d063-4167-9b30-5c04ad71e0b6/21966907635.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144428454/bavasojedewukijaxot.pdf
    • https://uploads.strikinglycdn.com/files/c878b3f0-69e6-49e3-80b2-28fb856de925/83689518671.pdf
    • https://uploads.strikinglycdn.com/files/51dc6dd5-d042-4f2b-9c0c-3f2fd7d288ab/zadebamevale.pdf
    • https://uploads.strikinglycdn.com/files/5a079fcb-68d0-4ebb-9f1b-37f4ee90a76b/wigoginubupularedovedax.pdf
    • https://uploads.strikinglycdn.com/files/c3ed1b70-bc2b-4af3-920a-e9c04864c9f0/rheem_furnace_error_code_44.pdf
    • https://uploads.strikinglycdn.com/files/fb52cd57-debc-4416-a4e4-08bc353d215b/verb_tenses_english_test.pdf
    • https://uploads.strikinglycdn.com/files/79bba90c-dc7e-4cd2-a4b5-307afdae2f5e/28774776581.pdf
    • https://uploads.strikinglycdn.com/files/254e233d-e73a-4781-aa9e-ea6743b69df4/sesshomaru_and_rin_lemon_pregnant.pdf
    • https://uploads.strikinglycdn.com/files/636a35f7-b09a-46a8-bd32-0a28c3341b1b/kawasaki_engine_dealers_canada.pdf
    • https://uploads.strikinglycdn.com/files/2d792cf5-5caf-4334-8d33-a7bfd3451e9d/sinulubanebixano.pdf
    • https://uploads.strikinglycdn.com/files/73534d98-788f-4eb2-8e10-077589a3dc2c/best_salt_for_hague_water_softener.pdf
    • http://kedetuwi.pbworks.com/f/nuwexiwamudukisafelux.pdf
    • https://uploads.strikinglycdn.com/files/51bd761b-20fe-40c5-8eaf-c2f1c7753ca1/timusub.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_off0000e811.bin
3a1f54b274fff54b06c0870566297f8fe5fb123c226571efa5b82725b4be5ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 5572 bytes
font_01_sfnt_off0000faea.bin
47b73091a4379268a30e4c534770bd5ed708e632e502b822641217345d417094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 10584 bytes

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