Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c7caf26839d33f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-10 06:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6896eb537010109d8a420add2ac95950 SHA-1: 72e624f7207492d3ccd8740b24b5c5110507fc5c SHA-256: b4c7caf26839d33f773da5ae554b709ab5cafa3d20a5452fde206e5714ed8663
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords that appear to be a lure for educational content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/wix?keyword=periodic+trends+gizmo+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_603440fe6b99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_603878b294493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378383/normal_5feba93221586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_602e371790602.pdfIn PDF document text
    • http://jinunagavep.iblogger.org/vegiduvoneganumo.pdfIn PDF document text
    • http://tojagetuwiger.iblogger.org/como_hacer_una_maqueta_del_modelo_atmico_de_bohr.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/bogusoxepimofonatowo9xrmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fd39f07abca5.pdfIn PDF document text
    • http://appletopshop.ru/tamil_advertisement_mp4_videohqgfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_60362b7785d7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ff348980cd00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454184/normal_5fcf144111b84.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/nazekisigiduz/why_is_the_castle_of_otranto_important_to_the_gothic_genre.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/boluxixope.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/audio_technica_lp120_usb_turntable_lowest_price.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/79346773784.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/trimble_business_center_hce_2.7_download.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_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 5368 bytes
SHA-256: 336caf88ca77f7aa248e2d374c670e2f14d76197f4fdf25801b2d1813abf594b
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 10612 bytes
SHA-256: 678abfa3a03cc3df09bb35d5f40e4101814087d185e1728d5a6122030936b3bf

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