Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1677f8bbae146fe…

MALICIOUS

PDF

97.1 KB Created: 2021-06-12 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0db584c584a861c279c7eaf9ef203bbd SHA-1: e3520c29d668ac3a5a71fdc2f375e9c6d6c06353 SHA-256: f1677f8bbae146feb8aabd21c95aef9c5002f8f7a8bfe9296a8248281c13a7b4
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that directs to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'the biafran war pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://resalured.ru/123?utm_term=the+biafran+war+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456705/normal_606e1cdb9d93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6069d18c19aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_60684f9793244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_606bbe8bd26a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_602545c74b7ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_604620bc4fcaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_6046431c6fd7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5feb73730162c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_60637b028a9db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_6008fdf1a0cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_604645c53ade7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443594/normal_606e05e262be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_6031dea5bbe64.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470835/normal_60b32644d0593.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://uploads.strikinglycdn.com/files/ad5fa6ae-ec33-4c88-849d-ae50c6de9a94/21094770901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9257e3e-3a43-410e-bcda-ced6077b035a/12772908052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfda00d-1f11-4d08-96bb-14b0a007913a/47901780843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368b1faf-650a-460c-ba6c-4093f9d4e44a/60637232159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc261bbe-e869-4264-ae3e-30a4d6eb7ca0/honda_generator_eu2200i_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0588380-aecc-4ae6-8bc4-94a8b27aa678/patir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e88834-0c30-433e-aec3-9b5df511a4ba/is_one_punch_man_a_parody_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0c6a1f-def1-4d98-bafa-2a4292975067/guess_the_emoji_cow_and_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92208f99-3947-47e3-a8b8-5d1efb4e26b4/kexabugudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6f5812-03f4-4939-8f41-fc953b868b87/surege.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_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 4700 bytes
SHA-256: a841a0b27f49caa20b41da3bb39fe4ce902cf55cd6a35e243ebf369a54d4a172
font_01_sfnt_off00014416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14416 10784 bytes
SHA-256: c9b02db851b638ec9d4d43673e3623850f44dca2922c220768d7a62c7c72113d
font_02_sfnt_off000168da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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