Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65b30d298d61d72…

MALICIOUS

PDF

81.4 KB Created: 2020-11-25 00:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 667311afccb528930c47f4ae859a9806 SHA-1: ba536429f02e4fc1a7c8ba3ae4061ca281513b38 SHA-256: f65b30d298d61d72b614c414678b1e08f9704a7dee1ae2fba35e59631bb61c81
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a heuristic for a PDF link farm. The document body, though corrupted, suggests a lure related to a 'case brief'. The presence of external URIs, including one pointing to 'traffine.ru', indicates a potential phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristics suggest a malicious document designed to redirect users.

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=lau+v.+nichols+case+brief PDF link annotation
    • https://tapojofam.weebly.com/uploads/1/3/4/5/134518610/1456834.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/tapexirek.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/fuwawibu/laptop_repair_course_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/excel_dashboard_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3589c84b-a8b3-43b4-ab1c-1593c643d12c/lineval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ef22bc-e890-4b1f-bd32-42c1e1cfd0ae/88867784814.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/tovafalikorosajiguji.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/werexibivibixuvenikako.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/95650462327.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/95023799573.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/pong_app_inventor_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/translate_portuguese_to_english_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e75fda-147c-4749-b74a-99ecb612092a/mole_mapping_procedure_consent.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gubutoripe.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_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 5144 bytes
SHA-256: 9d975675d5455467a5e2927ec8115c81099b7a6793ede344825aebee35b6dbae
font_01_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 10884 bytes
SHA-256: b45499457d80a9aef7ba641436df74a0af4a776de3265ad7e0b2d191c5ddf07b

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