Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b01ac82a73664f…

MALICIOUS

PDF

66.6 KB Created: 2020-12-04 04:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b324ec7be6b660577b94747b3073eead SHA-1: 7529ec5bc37e98822467091242aea2affe2aaca2 SHA-256: 21b01ac82a73664f3729be4c57a6b85c6466344f90019e277e992af5b9b502ba
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that leads to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a school calendar to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=eagle+middle+school+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5f8dcb02b77c0.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/fodose/lebiwulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9348d537-cd46-428d-80c8-d4aca33013dd/attack_on_titan_tactics_reroll_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfdc47a13a450babee0d2c/t/5fc601a53485235c86952579/1606812070087/hotel_on_the_corner_of_bitter_and_sweet_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb5b860-a28a-44f5-8795-8be5a3858f2d/clinique_lid_smoothie_cashew_later.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/andersen_storm_door_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634bb6b0-4075-4086-b402-f83ca390912e/71315767699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09287828-eeb3-4576-80de-5017a0aa6db2/rusazonufawodadovapa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0fb873299f0c543c6926/1606225849282/85182041738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ff184c-f606-4421-b759-fe9f865c0801/one_punch_man_flashy_flash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7966592-3751-4940-8f9a-304a70db92f4/ruxonuwakanu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0de27085bf90c0efce9ba/t/5fc1286c3485235c86f033c2/1606494316443/77745400378.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_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 5308 bytes
SHA-256: 5f4a8d53004ab5774922620516af1fa14d704d19798147989a856e9150c794f0
font_01_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 10080 bytes
SHA-256: 340b84b000d5711adededca631a6fa29403b953b08b19b453dc71d74e860b5fa

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