Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db4e43c5984b608…

MALICIOUS

PDF

68.8 KB Created: 2020-11-25 10:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b5355291bfd609418de7cce8828396da SHA-1: bdaeca1522d51beff0ef9ef3d53e29509b15cfdd SHA-256: 3db4e43c5984b608790e7eea8cacd617d84a53e58d298a961e991571c962c3ff
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to external PDF files hosted on various platforms, suggesting a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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/strik?utm_term=borderlands+2+in+memoriam+guide In PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/koduka-manunadiwebawof.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/53eebf2ff.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/ludumijafimuzopa.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/wumodukubaru/90730864266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b403e408-5b5b-43a0-a6d4-edc37dd72ccf/54377291218.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/zimsec_a_level_pure_mathematics_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/66894938496.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/interview_questions_and_answers_on_cyber_security.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/color_by_number_games_app.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/83703464222.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/k_p_astrology_books_in_telugu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/ilr_absence_letter_from_employer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/fukebomenadulaxebix.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/unit_8_study_guide_stoichiometry_answers.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_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 5328 bytes
SHA-256: 3fc790f4139f597ce0c1372decd03c60574e1afcf0ee7a199fc212de7ce431a4
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 11828 bytes
SHA-256: 75ea4699f58b3cf4e3e1611614d7e8b74a118d4d1880e5a5dcbc8e3c4614b406

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