Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c3aa65565dacc1…

MALICIOUS

PDF

75.5 KB Created: 2021-03-28 13:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 96fd4c49af18eb20e0f96c6335ccac2c SHA-1: d9b153673257018bc76f2db47300c3e1acfec417 SHA-256: 83c3aa65565dacc1b4f30b5bf16c03a8661a538e4ade26271b6225ecacecad77
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a book search.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=a+dozen+a+day+book+5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409396/normal_604db478df897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5feb0c6f98ed8.pdfIn PDF document text
    • http://sepotutudi.iblogger.org/85005569269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5ff806ffda715.pdfIn PDF document text
    • http://sugemug.iblogger.org/37231875319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_602dee4f63493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_602318fedea7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6057aa7803b27.pdfIn PDF document text
    • http://kirazoki.22web.org/biodiversity_definition_biology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_6039a358af74c.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/171d79b8-ac01-4d76-88bd-e68f277cfb8a/stephen_king_11_22_63_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31136fe-995b-40a3-9692-8cfb9bd2c188/amsco_apush_2018_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b20f99-21dd-4978-98d4-f4808183d9d7/how_to_cite_words_from_a_video_on_premiere_pro.pdfIn PDF document text
    • http://bileperiwuxi.epizy.com/bases_fortes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17175b4-4870-48e8-9240-3205af194841/23351130540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990b1e6e-2946-4d28-afab-61711bcbe2f6/58435291218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5939fc-db71-407e-a9f8-0a0d0d5b389e/46748737920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d234ae-cb66-44b0-b35a-a55f7bc17312/82433898437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d124e3-e78d-4b0d-8c36-43d7d8777b5c/warriors_lost_stars_main_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0db550-2e77-4983-bc2a-4fb98b0d7918/95939654194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a76852-a2bc-4114-b015-cf14d7776bcb/97535631651.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_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 5196 bytes
SHA-256: c24da49cc073db156f281204f30f8dcc9edac6d37fcce5aa82bdb7936051535c
font_01_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 10980 bytes
SHA-256: 86a75522220f149c9b4c669d5e5a5b759f12e8fc03a9a9c75d1b8a71d843c80c

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