Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc4ee0258ff9f5f…

MALICIOUS

PDF

84.9 KB Created: 2020-11-09 20:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63eacc3af1339a86a894c9980211384b SHA-1: b568f8428a255d3c6fc1de340e583d1f5cd59a2c SHA-256: 9bc4ee0258ff9f5f971dcfb910125288e625a96191a8072e2e0072a4383f0636
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, indicating a potential link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://trafficel.ru/wb?keyword=wild%20cherry%20band%20wiki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f903c320d481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fa185fee0e05.pdfIn PDF document text
    • https://kusezobovezuzeg.weebly.com/uploads/1/3/4/6/134689385/forizamova-vekipofodutu-kinopiwufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f88a0e39ee31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5f971b562addb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5f9ae88a5d483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5fa544d4caf98.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/d0bb8079-1ddf-4d8c-b270-a12659aa204f/1868472854.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/color_mixing_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b215e748-2459-462a-b142-94b58f3e3028/42306534083.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/265_70r16_tires_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ab3614-1b9d-41bd-a7be-0a85db78edb3/wwe_2k17_ppsspp_apk_download_for_android.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000112f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112F4 29068 bytes
SHA-256: a57796f232bf14441418d57bd1f4510636b486047e428fb45e04f6e53e170f9a
font_00_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 5260 bytes
SHA-256: eace3e53f52392c61e92102d552c2e44e1de7ff0ac09b03d2a23ad083a5047a9
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10592 bytes
SHA-256: af353cb7d8b66d722489f98f7568430386fb63f6da6be201b31658ff912d2818

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