Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a3de04e8d59b5a…

MALICIOUS

PDF

99.6 KB Created: 2020-11-30 07:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2dcc33939ff7abcdae2ef40762ef45f6 SHA-1: 9d109ae3fb62bc4f9e3f31f0015aeb44e2fd23dc SHA-256: f6a3de04e8d59b5a213aee2cb340de71986f7b5efdda7faa25e79efc5f4ef4ed
156 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 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 0.9997

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
  • 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://traffset.ru/strik?utm_term=mr+pearce+aquatic+sciences PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495269/normal_5fc2bfc34b513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5f9ee0c4c1031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8ff24b3755e.pdfIn PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/xibawudilategovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fbf3bf0a9845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_5fb30d906a081.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/sodiwenavugajot_dusat_xalezasesipir_jagapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f8848b2702e2.pdfIn PDF document text
    • https://rivibesosad.weebly.com/uploads/1/3/4/5/134529272/c2d27359a9d4.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/lurutopobi/vevifixupikuso.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/video_er_for_facebook_and_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/36689990741.pdfIn PDF document text
    • https://s3.amazonaws.com/fokena/18436385344.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/66250208879.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/ca_folicular_de_tiroides.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_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 5028 bytes
SHA-256: 014ce47b1c61f51ade3918bcfd38aa730453c1e23ebb9af1d726315c6a801cc2
font_01_sfnt_off00015708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15708 12320 bytes
SHA-256: c139096688b5586bf9a5946fa446c3aac3eff3a1887b0705c81bb9afe368b728

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