Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dedf6ca668aadf6…

MALICIOUS

PDF

82.7 KB Created: 2020-11-27 11:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fb3e2027aaba634fa3b441eb715e39a5 SHA-1: da8a1ac7e0c9d896f5b2c734a32c293a648f24f2 SHA-256: 8dedf6ca668aadf637c9a04f412683d75732e01fcd7ebf51a5b96c8224b29cf2
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=no+1+chinese+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5f9df9b573994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5fa33306dc1a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5f9b5c0255958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f96ba47223a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f9212809b02e.pdfIn PDF document text
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/5efdff3d4.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/sowafi-jijisoxavaru-nazulise-mojolubut.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/22a249d1-c5de-4780-9483-46e3081f2757/nclex_rn_examination_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/28914179512.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/kobugelisuzosoga.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/vuxoxenejolup.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/rimuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/88165019394.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/round_rock_high_school_track_and_field.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/luzatutozeremazafi.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/40047930353.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 5028 bytes
SHA-256: 8a26342c5a4967b9845b666180ec3a0b6b4779aa5a48e5bfa7dfd93ad66c1dcc
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 14144 bytes
SHA-256: 65a970213353a6ec72d5c6edf4f649273b5094bc4c97747c92146c9eb1b5da56
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16544 bytes
SHA-256: 4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc

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