Malicious PDF — malware analysis report

Static analysis result for SHA-256 793e124fd303719c…

MALICIOUS

PDF

127.2 KB Created: 2021-03-11 18:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6298391fde06996f7d1c8d36fd4d9467 SHA-1: ef8858a8195bed057418a38317eaf6057ccc6f20 SHA-256: 793e124fd303719c71431d8ea6633a86c94e30d896bf2766d2f1f6b31dbcb81b
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, and the ML classifier strongly flagged it as malicious. The document body, though heavily obfuscated, contains text related to 'dental clinical examination pdf' and the wkhtmltopdf tool, suggesting a lure. The presence of an embedded URL indicates an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/award?keyword=dental+clinical+examination+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387430/normal_60090a41f2458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501659/normal_5fef54ad3adf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5fdb8b08c9762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481662/normal_60052c066446b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6036032b6bff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_603e75f54bbd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5fe387df627a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_600f76ba330a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_601262e2b3507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_60479d227bc8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fccda7c6c675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5ffd4770312a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_601f13e085cdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366306/normal_6005eadcdcbb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_60299ad8b20cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fe01f0468a26.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/tikofaketonub/pemizareluwibubezivikoju.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/internet_browser_pc_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7207a328-fa80-428d-b5eb-f0bb6798ce61/what_is_the_lesson_in_dr_heideggers_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/vetixajimabuxal.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/1417232359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55334bb6-ad9b-4b51-b214-4654bee2ca8c/how_to_replace_poulan_chainsaw_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/711fd361-ccb2-46d2-9555-0d75ec9f5ad6/all_the_things_you_are_chords_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/ssc_mts_admit_card_2016.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_off0001b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B019 5096 bytes
SHA-256: 2f652c3bceba8141db17ca517dd99bd0d9fbfec901a04edc5a3e2464249db3ba
font_01_sfnt_off0001c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C172 14252 bytes
SHA-256: 5f0a15c62fee74b639c98ae572820c5253143678ec5ecf5cb0d2d7a15c3ad81e

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