Malicious PDF — malware analysis report

Static analysis result for SHA-256 355f6ce0176c33ce…

MALICIOUS

PDF

83.9 KB Created: 2021-04-02 22:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bfcaaffdd3ae4bbeb5c8fb1f4bca947 SHA-1: da5921696968f9e40ff3342d9d7223f1b664261a SHA-256: 355f6ce0176c33ceea4336de5cea931f27a1800b359d825125e98d1dcdc0795d
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that directs users to a website related to self-defense, likely as a lure. ClamAV and ML classifiers have identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of an external URI and the overall classification strongly suggest a phishing attempt designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+to+defend+yourself+in+hand+to+hand+combat
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fc7b56ba10b6.pdf
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/7789537.pdf
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/vizigadirezenupat.pdf
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6042217b7f321.pdf
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/pofozapuwi-zovafewulos-juxipunederu.pdf
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fe1d0d7c7560.pdf
    • https://sesoguxanijiba.weebly.com/uploads/1/3/5/3/135309487/2855939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_5251258701134c46bb0cdb346b5da4f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f870006-8958-460d-9a80-16644035f972/86004368583.pdf
    • https://s3.amazonaws.com/fosalizuzu/el_cerebro_humano_libro.pdf
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_01e2b3ff7f494d369a3915cfa601c43b.pdf?index=true
    • https://s3.amazonaws.com/dumupa/accounting_ledger_excel_sheet.pdf
    • https://uploads.strikinglycdn.com/files/6389e4f2-759a-4807-b473-1432f2c21553/zuvepufiz.pdf
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_eba6daedcd794725a4b433412184501e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6fc37dee-da61-4d0e-95a7-587761132f71/le_bistro_pet_feeder_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/0b6f3eb2-952a-4062-b816-ba4dc49eddd9/nojakokewaludobijogeb.pdf
    • https://uploads.strikinglycdn.com/files/a6790c74-5828-4a78-a079-ae9cb1b660df/signing_naturally_units_7-12_free.pdf
    • https://s3.amazonaws.com/tokudapele/chamber_of_commerce_employee_forms.pdf
    • https://uploads.strikinglycdn.com/files/e3d2e8f7-662c-4937-96a2-6792ce806068/dugar.pdf
    • https://s3.amazonaws.com/lanaladu/dogobotajuduwabumukefevip.pdf
    • https://uploads.strikinglycdn.com/files/87afccb3-71ba-4db2-b41f-cc0178030c1b/when_did_we_enter_ww2.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_off0001096a.bin
ad18a0396d22d826282dc63a9fbc312e007d8557e1092a0085c77cca540d70a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 5556 bytes
font_01_sfnt_off00011c3a.bin
c548834180aaabbc017e5ed435cdaa9ead1e0013e9e0a151661eb78361ac3c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10828 bytes

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