Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c8ee6f887884b0…

MALICIOUS

PDF

69.6 KB Created: 2020-11-21 20:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fef38a718771d58c56d55d9d89490c57 SHA-1: 95d62e7903c9760f6a16059f48902becc004eb76 SHA-256: 25c8ee6f887884b0111356acccc4571d88f67d09591d2a9611c6bae380a40bbd
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/aws?utm_term=full+extended+bed+sheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fa39092d321b.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/rujawagot_vefoloxe_wuxapinofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fa44f6245c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fb72aafbb877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fb54a5d0bc3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5faa5a453e9db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8722ecc99e4.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/viboxikuz/easy_trombone_solo_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320acddf-bad9-46d7-a5b5-64bc420b66cb/operations_of_rational_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/beatenberg_rafael_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/desinimutovezowovofotuwa.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_off0000d48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 4772 bytes
SHA-256: bf67a1bcbbf688f0a99f6c43095e37122e342c0fd991d9089f5962f5b67937e3
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 11000 bytes
SHA-256: 4982e7456e0a373d4961cc2af6a930457e38dbf1d309069c720bdffc0812747b

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