Malicious PDF — malware analysis report

Static analysis result for SHA-256 86462f2965a8c547…

MALICIOUS

PDF

83.7 KB Created: 2021-03-08 12:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 31c8519af59d0341960e9425884e18d9 SHA-1: f1d63a50091067fa8a1b1344a2076777426a218a SHA-256: 86462f2965a8c5477e8a44adaff6cc7010d376428b2fa41206f506b879f39e55
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. It contains an embedded URI pointing to 'https://jumiwimov.ru/123?utm_term=adding+fraction+word+problems+worksheet', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'Adding fraction word problems worksheet', which is likely a pretext to trick users into visiting the malicious URL.

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://jumiwimov.ru/123?utm_term=adding+fraction+word+problems+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402932/normal_600821c3617f1.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/60285572584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6015219262694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5fcf9acacd126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_6035ff890ac51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_60098e3e9dee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_6039040ba90ed.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/1292228901.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/dufekifaral/29974930403.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_0c8d0409d3c042a9891b7d4ed7a33959.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f27e06-714e-4ae1-a149-c4c0f078072d/vogonuxuturivamifojubukow.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/boettner_roman_catholicism.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_63dc4867838840a4b710f97f28af5713.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tofizo/help_informatica_ibitinga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7528a19-7c19-4cb6-a6b9-a8a163082a45/pokemon_soulsilver_kanto_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59af836a-2d58-4644-a7ac-a224ceacd723/what_muscles_does_a_jumping_jack_work.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/wiredu.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_84e5db075ac540789b39128c8a7bc51e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/fractions_math_exercises.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 5856 bytes
SHA-256: a9fc1ca8984ad699f70b4271c8ee4b143d8d3215283dab6fb9f98b1a52574798
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 11704 bytes
SHA-256: faa9dbfd9d222bb00cbf9c78ede174546ba88461ae00bb7c903252f89e92cce7
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 17412 bytes
SHA-256: 060504adae2c4c52859946120df43f725296eb1b5d242d40749d1c219f470e33

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