Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c694510e5a257db…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 01:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 242ce0c942699656c02835b0f39cb101 SHA-1: 9721ae952234095ec279c17cc13732e778715037 SHA-256: 7c694510e5a257db4f80f2f93c3bf12e1a511bfb477732848127a4b331fcbd2a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing campaign. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic (PDF_SEO_LINK_FARM) suggest it's designed to redirect users to malicious content, likely involving embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=science+laboratory+apparatus+pdf PDF link annotation
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/witupiwaga.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/three_hands_of_fate_pad_guide.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/2f3a964382.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/wopedarunawe.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/db7ca096f388.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/gubimiro_pivezanogoga_velafiminosulek_bazidivexa.pdfIn PDF document text
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/4326956.pdfIn PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/xaxesawuduboki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jotizifime/masekufukufoguzasoros.pdfIn PDF document text
    • http://kopuperoki.epizy.com/jomokupomitubilogikoj.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/aaj_tak_news_live_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9eab2ac-bca4-4dc3-9fce-912757fe06b2/63072045807.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/33628350301.pdfIn PDF document text
    • http://katosijuxemewex.rf.gd/medical_biochemistry_textbooks.pdfIn PDF document text
    • http://porugunime.epizy.com/be_here_now_ram_dass_review.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/momojasakinujewurug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2285c238-c0cc-448d-9013-12cf444df2bd/is_the_dymo_450_wireless.pdfIn PDF document text
    • http://dinijeti.rf.gd/4592212545.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 5376 bytes
SHA-256: c95f55a9b9b5c4cc98db06fe6da106ff837f75e888c44ca406d1996e19513756
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 11016 bytes
SHA-256: 87e4c93fde46203624c3d2913f409865e840b96155ce3aa53af007919f916f5e
font_02_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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