Malicious PDF — malware analysis report

Static analysis result for SHA-256 237d355462f150f5…

MALICIOUS

PDF

65.5 KB Created: 2020-11-17 18:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: aa0a96d71237edb1fc54685c20e4fe36 SHA-1: c32581f4dd79e55daf2c55ef90b307dd7ed6dcdb SHA-256: 237d355462f150f5620935754dd62a1086fa22ef99a64913e875a0f8cae33f67
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'traffset.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a traffic redirection scheme. Although no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to direct users to potentially harmful content.

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://traffset.ru/123?utm_term=aesthetic+coloring+pages+tumblr PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fa1f35b8153d.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/2736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fa41ba05b511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f93eef9ed753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5f9e5adfb647f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5f92910e29a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_5fa304bf42cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f875afd19f99.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/sakebemerim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fa22d13d3f80.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/7b2ad72d-dc57-47af-b398-08c02636b5ae/last_day_on_earth_hack_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8027fb64-7aaf-4904-a9d3-5b8680cee14a/common_and_proper_nouns_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194de194-35f9-44a7-b4e1-1c625207410c/9275599440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23b5d90-338e-4836-aef2-af2c4cca9917/zavum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e48f03-2ee9-4635-9c95-efbe90fec68a/ninjutsu_techniques_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964722b7-1245-40fc-8f92-5ac0f6290ac9/flour_bluff_corpus_christi.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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 5476 bytes
SHA-256: 7a602211dd0eb111f18f506a40d7583d1b8283940cb1da7d9d2ed6742f43e845
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 9784 bytes
SHA-256: cf0d073c3446c6eb677f1bb86cc7dde4e61392508f5260ddf88e540f689ffa17

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