Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3f4a43bb539916…

MALICIOUS

PDF

89.3 KB Created: 2021-02-08 06:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e81dd26bf95a99307af367d7921d7650 SHA-1: 00db92bb1c8ae89c3ed4c0c66559e4a507ecc18d SHA-256: 9e3f4a43bb5399168ff6493fcbb70b96d3c8dce73782bef16df2f023bfb0f1d6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics and ClamAV as malicious. The document body, though heavily obfuscated, appears to present a mathematical problem, a common lure for phishing or malware delivery. The presence of an external URI suggests an attempt to redirect the user to a malicious site for further exploitation.

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://jottigo.ru/123?utm_term=find+the+area+of+the+shaded+region.+r+%253D+%25CE%25B8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fd268ccf2429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_60206ebf01d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600bef2f485e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6001d6a7c697b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5fe41d422e7b7.pdfIn PDF document text
    • http://lovapezelewog.iblogger.org/68079549769.pdfIn PDF document text
    • http://sapinatuligoro.22web.org/hospital_incident_reporting_format.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/jujadodedaruxix/58657566748.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/wadimixo.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/temasigo.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/45120739541.pdfIn PDF document text
    • http://funurebebepoti.epizy.com/wojasitaxefebibuzinada.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/vowel_letters_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/xavatusosonejazuta.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/41495484912.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/android_9_vs_8.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/wunidatox.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001278d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1278D 25048 bytes
SHA-256: 84a9ef0149f2717198e613d4f937ed624caca2dab6c2b3ae47022e093a8d74de
font_00_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 6608 bytes
SHA-256: 2721f503b759a2d51f679397e7eae108c0e91525da045600337ffb7a5da25207
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5280 bytes
SHA-256: 607bcbd6075eeeb2e24e6045e2732b8ac7471ade109cb50f9d0f10e42f3487a1
font_02_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 11716 bytes
SHA-256: d1a7a4ab75b6e41034a52e7a09b86afc411fa06d71d3cbc3d61d8d8ffad510d5

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