Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e183b7dfc847d66…

MALICIOUS

PDF

60.2 KB Created: 2020-11-29 20:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 85e615d0480cadbc7fb8cfd25599e653 SHA-1: d612505e18451cee12ff8cef758191d8caa98fbc SHA-256: 2e183b7dfc847d66d9962554659753094c8bd804d262c24c67905b8e39658213
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm, suggesting a tactic to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=linear+pair+worksheet In PDF document text
    • https://mupaxezofede.weebly.com/uploads/1/3/4/3/134317166/8015999.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/dovaxevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fad59a8299f3.pdfIn PDF document text
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/8993662.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/feborobegibew/pakepuzajenaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/ancient_rome_mapping_activity_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/believer_audio_song_in_tamil_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/28867838689.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/pafapa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/memorandum_and_articles_of_association_uk_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/4722399568.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/fishing_walleye_video.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/29050855745.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_off0000b15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 4972 bytes
SHA-256: 3d46d7b540047fac458d744202a96717d3826a5989b4883f30eb3568113b1fa6
font_01_sfnt_off0000c259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC259 9944 bytes
SHA-256: 36aa34a8b620ab394bf63e3b7ba0dc7788e7f6a9d74a960f768c2db1745f08ca

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