Malicious PDF — malware analysis report

Static analysis result for SHA-256 d769ee3e0c37a805…

MALICIOUS

PDF

75.9 KB Created: 2021-02-10 21:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e551a01ed6f10be2ca9f81c71ffd5237 SHA-1: a8dbd7a61e01a145415ee3961f8efd63de4f8701 SHA-256: d769ee3e0c37a805aac405216f216a6055427f178632447a712d8dc6c3446c4a
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and a phishing attempt, specifically flagged by ClamAV as Pdf.Phishing.Trojan. The embedded URL, https://maypoin.ru/aws?utm_term=dbf+file+format+viewer, suggests a lure to download a file disguised as a database viewer. Although no scripts were explicitly extracted, the PDF structure and ML classification strongly indicate malicious intent, likely involving the execution of further malicious code or redirection to a malicious site.

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
  • 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://maypoin.ru/aws?utm_term=dbf+file+format+viewer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fdd2778a4b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_60223d358768d.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/eRjghjn/fosibudofunuworazap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_602026ef27419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_600ffd87e6b97.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/4jeriaT/43533587224.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/cRoRjbB/modinofarejebivezasufefu.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/jbXjfcI/at_t_prepaid_customer_service_representative.pdfIn PDF document text
    • http://velixone.66ghz.com/64677167138.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/hslhghi/nebuseki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5fca86891cc5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427095/normal_6008fc0d86503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fdfd3b554adc.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
    • http://valigajemebid.rf.gd/spring_boot_tutorial_for_beginners.pdfIn PDF document text
    • http://kagowuv.epizy.com/lunepikab.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 4708 bytes
SHA-256: b55816636c5662ace93dbd64762459d3b339fbabdcff63dbe28907c8f2afb335
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10880 bytes
SHA-256: 3e7c1fadf995f08d14c24cc7e33e8f4405a52c7c8c6f18b47df306e0d27a22a0
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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