Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a057cbf4cf3d99…

MALICIOUS

PDF

83.1 KB Created: 2020-11-14 06:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 754d844e70a213c67caaebf628d889a0 SHA-1: d85a7d37fdf475118f600ae53f7dd242c33ae8e3 SHA-256: c9a057cbf4cf3d99566f8dae7fda391d06029f018da2591639f14eb99e18b99b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://ggtraff.ru/123?utm_term=chinese+happy+birthday+images In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5f97fd072d1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fa8e7e515440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fa88924d1668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5f9d777901f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f904a5e3f53c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_5fa3ae1a56749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f8d6f0dcb26c.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/rizijubovapuk/67573980396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22afc95a-a76f-4643-822e-2bb75ab509fa/vawogife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1b5f69-5612-4b68-a4df-c48ad584adce/79303315105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5164f035-8e2e-46b8-b417-96d08e72ce86/apex_legends_text_to_speech_rap.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/ups_store_amesbury_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a710ac-6cbd-4736-bb0d-d25932ca7970/gagar.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_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 5488 bytes
SHA-256: 1f280c89d7126312d4f2a82b4429499274addf256cd690fbb0d01935823c97ec
font_01_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 12508 bytes
SHA-256: 312d0fe55ecda441052f20a4bcd70339b1d874f8eec700c405a4ecd861ae2a44

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