Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e85bb22fa3d72f8…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 04:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03acb0e533c07777ac3716186d2d1cf9 SHA-1: b7b403b8a9de4277ccded0d8af8d753e0e3a6c40 SHA-256: 2e85bb22fa3d72f83e7edf28d241be69acfdf15640d79fae795555b2b6262a2d
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely part of the phishing lure. The document body, though heavily obfuscated, suggests a theme related to educational materials, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=mitosis+internet+lesson+answer+key+biology+corner
    • https://cdn-cms.f-static.net/uploads/4392877/normal_6015a9088cb15.pdf
    • https://cdn-cms.f-static.net/uploads/4443810/normal_602141a6612d0.pdf
    • https://cdn-cms.f-static.net/uploads/4465402/normal_6015c6e31eaa4.pdf
    • https://cdn.sqhk.co/posojuvapono/Uhfjfjf/camon_live_streaming_apk_download.pdf
    • https://cdn.sqhk.co/noperizapewo/iichgtC/47817586475.pdf
    • https://cdn.sqhk.co/melipetoluf/jihi5Tk/community_service_project_ideas_during_covid.pdf
    • https://cdn.sqhk.co/xexogataza/gvjbjag/29032031965.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_600ce8e2e156d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b0f03adf-5d77-4ad9-8e2e-11db0ca39c55/52665568424.pdf
    • https://uploads.strikinglycdn.com/files/4633cbd6-50f8-4308-8c00-aa3b50d61802/data_structures_and_algorithms_in_java_course_free.pdf
    • https://uploads.strikinglycdn.com/files/9bd009b6-c60e-4e43-9950-c408e8cc7421/example_of_a_written_research_proposal_in_chemistry.pdf
    • https://uploads.strikinglycdn.com/files/1a6bce3e-0c5d-496e-8c1a-b8cb437c3d01/50638321120.pdf
    • https://uploads.strikinglycdn.com/files/0f44994a-f389-467a-9960-36b780589afc/sotamowemijevikigul.pdf
    • http://retatek.epizy.com/574402136.pdf
    • https://uploads.strikinglycdn.com/files/a0bb4103-a5ed-4303-939e-04dc090e1508/17941120196.pdf
    • http://pizibajavodup.epizy.com/roduz.pdf
    • https://uploads.strikinglycdn.com/files/2595371e-e849-4a31-8659-87ca1a40a42f/fojelokilesonezeg.pdf
    • https://uploads.strikinglycdn.com/files/6b34ceeb-5f07-4107-9279-98aab0cd69dd/liwererujerigaponapa.pdf
    • https://uploads.strikinglycdn.com/files/8f125c37-d5b5-474d-b8d5-19b2b0d8aeda/wewadufenawe.pdf
    • http://saxajimapapix.rf.gd/belgrade_tram_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c6.bin
c2bc44004a0ae808dbde1208df6083112d3c19c7940fd5b7ed1bdda5c0db58f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5160 bytes
font_01_sfnt_off00010878.bin
7a1903b6735d883de8d20d00b9cb12826e0ba1a9138dceaae0c12d7a7e7e613c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11064 bytes
font_02_sfnt_off00012e43.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 4324 bytes

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