Malicious PDF — malware analysis report

Static analysis result for SHA-256 9371dbc087cf0d5f…

MALICIOUS

PDF

85.0 KB Created: 2021-03-30 23:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7cca10231474cd32757a465b4b9ffb2a SHA-1: b9e6560c2d7a1a0a47ebae092723bdda98e1b58b SHA-256: 9371dbc087cf0d5f16d919472d7d137480627ec60f8390e537945131bbbccae1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to an 'exponents worksheet'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=division+properties+of+exponents+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/veladaxuzeba/ibigghB/94820208571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_600e7ca2a61d6.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/wxhafQB/5982190886.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/58VOPl3/pyramid_run_workout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fd2692f6aa90.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/dggifDk/heated_high_flow_nasal_cannula_indications.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_5fd1e82f3875b.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/djiGB0m/devudovatitetujowati.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/kGKhaha/texas_holdem_poker_online_real_money_australia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d62d4d-27cc-4c6e-acab-d86ba3204471/can_you_factory_reset_an_iphone_4_without_a_computer.pdfIn PDF document text
    • http://lomemamimabow.rf.gd/jesesuxizikisew.pdfIn PDF document text
    • http://gobozukelawi.epizy.com/74765812681.pdfIn PDF document text
    • http://benuzawawefe.epizy.com/gsfa_mcc_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69820f9a-c9aa-4d03-8b2d-7940e2c7c9b4/59848102871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9c1a39-55a0-4798-9dc5-38c1f4bc5375/maytag_4000_series_washer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea848e8-b945-4aa4-89d9-a37a7eb4f6e3/58629257477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55df3b96-543b-482f-b83f-c2eae9ff0100/im_dreaming_of_a_white_christmas_elvis_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f266d7-1140-41fb-86a6-2ef29af4f2fa/48371265439.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_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 5172 bytes
SHA-256: bfb12119a28a3608df1cb40f5fa6989568e31b2611c1989957e32345880ee36a
font_01_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 12204 bytes
SHA-256: fff36006155f9dee5975ba62d7480929bd4baef3259d7eb4f1505623e3710e8d

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