Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7dac78444646ca…

MALICIOUS

PDF

71.4 KB Created: 2020-12-07 05:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 664aec6ac390938d8d76e5940f97e030 SHA-1: 841f64a991382ed76280f5257a85463c437b9b7d SHA-256: 0a7dac78444646ca806c591308c1072c7c3997d2deda5bf3fe93db0198d7bbf8
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://trafffi.ru/123?utm_term=ted+nicholas+pdf PDF link annotation
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/bamujumovajofe-vasoladujibi-boruputuken.pdfIn PDF document text
    • https://zugedogal.weebly.com/uploads/1/3/4/7/134748632/f019dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5faaca9832910.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/7546d2513e6dd9e.pdfIn PDF document text
    • https://bamaxasujobuz.weebly.com/uploads/1/3/4/3/134315865/sivolidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tubukeganuji/sodef.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/fawoxoguwedoziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4069abaf-45e5-4aa6-8da0-02d6a3b24b07/americas_got_talent_2016_finalists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07adf110-5979-4bfb-990b-8de85271accd/iobit_malware_fighter_free.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/going_bad_drake_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c29cd62-04aa-4997-939b-6d93bb27b983/graco_crib_with_changing_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc57c6f-eb66-4bb8-94da-ef1c909d83ce/muvimirurefagupeze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 4804 bytes
SHA-256: 909a126116a98d92a8466dd872a851cc3cef115abe375327a030b9f80663468e
font_01_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 11212 bytes
SHA-256: ecb8a9f86ea0a7190d405df6cba7d514ee42d1444e7ea15dc5e99a9a8d824e86
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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