Malicious PDF — malware analysis report

Static analysis result for SHA-256 778dca0eb6e788e7…

MALICIOUS

PDF

62.5 KB Created: 2020-12-21 01:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fd8c75c2044855265a8424868185a218 SHA-1: eed43f7fd6b853a7a6c1fda55c73e22aabda9187 SHA-256: 778dca0eb6e788e710926dd78bcea022f70f7397fd206d2653ccf66349fcdca3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are part of a link farm, indicating a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly suggest malicious content, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to a movie title and the wkhtmltopdf application, suggesting a lure to disguise the malicious links.

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://trafffi.ru/aws?utm_term=bhaagamathie+tamil+movie++hd PDF link annotation
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/4228253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fd777930e6fe.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://news.fresherslive.com/aIn 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://static1.squarespace.com/static/5fc0e8ef2bbd740658068d75/t/5fcbac2c8dcc5603bef96a85/1607183404969/60850910447.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f8ef9955c744b53bf1a6/t/5fca7b5edee23a47f8e0409b/1607105375088/putotapofakejesuna.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57785be9b69395129ae53/t/5fd0cd4a1c49363a9b536ce8/1607519563334/tuvivilalexuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/26581173494.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/behringer_truth_b1030a_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5621e8139af03766314ec/t/5fcc15c333187724c4dfe130/1607210447038/63453686360.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/credibility_gap_apush.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/dapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a33a1d3-4a39-40db-957f-d553499ce730/judas_priest_lone_wolf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf52b1e4-393d-4a49-8c76-1972c19a52a3/rawobu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/badshah_movie_song_ringtone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b148139af037642cc0d/t/5fc4fdd5a97599144e95dba1/1606745559558/zopejodogiwabezevibad.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_off0000ad41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD41 4756 bytes
SHA-256: ef54d458ac7bd4410dc1c5dde3525246c77ebba434681db981e5435ec09486bd
font_01_sfnt_off0000bd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD75 9808 bytes
SHA-256: 36007ea0766f4b0d2367e032c11210efa6ec8ba0db94a3bed8c7d88426b0f099
font_02_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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