Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1573e7e43c77f4…

MALICIOUS

PDF

77.4 KB Created: 2020-12-16 05:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bea8b06971ba69e4ad66e4920024501e SHA-1: 75a48030ada796e1adfeb712f8e7e17a8b3c9d28 SHA-256: 9d1573e7e43c77f4c900dc4506c5ed643ecc660612dbef279d1a357950104a6e
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into clicking the malicious link, likely to download a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?utm_term=10+3+practice+problems+chemistry+answers+with+work In PDF document text
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/zenebudibulikepep.pdfIn PDF document text
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/1717559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5f97714a77b9e.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/xulid.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/44c4e.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/8b5c2a89-08fa-4a54-aad3-f59965a93572/benab.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/barron_s_ielts_superpack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97aa188c-b3e2-4f01-81c4-1182a9fdd456/accounting_tools_for_business_decision_making_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb85ac1-f706-44c4-88e6-1e31fb7f4481/emilia_eberle_biografia_de_juan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f52def-41f6-4999-97b7-7369fd30ce3a/miami_dade_county_school_calendar_2018-19.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_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 12444 bytes
SHA-256: bbfdfa35a7fd81d6f5eefc07092e98f0d94c08ce2fe596c84e607f0cdb624c58
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5836 bytes
SHA-256: becc643ed2fe2432aca322f1d7576ba9cded93c75688b24d5c5c9f290abfb803
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10648 bytes
SHA-256: 32d051c3d76eef1969c711936e80ab2b2085f7b1cd246451f490bddcfea3311b

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