Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c16fe18319080a…

MALICIOUS

PDF

86.7 KB Created: 2020-11-10 22:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7259158da52245f630dfa42a0d0144f2 SHA-1: df7ea9271462f0519296c653c404bfaed41aab81 SHA-256: 73c16fe18319080a4030b53b4f39129e97edbd1583c87f22b7d38d591f4a31b8
156 Risk Score

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 embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?keyword=22nd+anniversary+gift+for+wife PDF link annotation
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/eaafb29ddf2bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5f966e452e91c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f89c9d8dfa25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5f9e7c035763c.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/5412858.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/953885.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f8a53d9dd5c7.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/biwubeleba/target_madison_east.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/skisploit_key_v6.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/peetah_bread_house.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/6787406383.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/starry_night_analysis.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_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 5332 bytes
SHA-256: cfe9cd2528fd26863d35fb2fee617115cc0d6e12f632ba6a2c6a8d996cd2b262
font_01_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 16736 bytes
SHA-256: 772e9b9b31269523f6785daac038a6886c1d6518a6268449c4adc9057fa41719