Malicious PDF — malware analysis report

Static analysis result for SHA-256 2405ec5303adf5de…

MALICIOUS

PDF

77.3 KB Created: 2021-03-10 22:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07afd4494ea6cf8e4c30f05fc4713d8d SHA-1: b0b430ac02957340982e6ed3c8052a6e9579f57b SHA-256: 2405ec5303adf5de3f4263e5fcc2d423c0affb2eb8b8bed52a2dd7b5f7d4943d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, with one URL specifically mentioning 'english language arts worksheets for kindergarten' to lure victims. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=english+language+arts+worksheets+for+kindergarten
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/1782526af3e.pdf
    • https://gawinesiti.weebly.com/uploads/1/3/5/3/135383431/kaxemetowenave-raniroveko-faxuborisefenix.pdf
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/6423326.pdf
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/2f0f84bb830e.pdf
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/pasofumijevo.pdf
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/3661622.pdf
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/gidewewukigakod.pdf
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/4ea8426b6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zibenoroduzuw/logical_framework_template_usaid.pdf
    • https://s3.amazonaws.com/wozowuledij/rirazowopatugusoxifasul.pdf
    • https://s3.amazonaws.com/fifuto/51059071473.pdf
    • https://s3.amazonaws.com/bezegoluzose/lamedetedapup.pdf
    • https://s3.amazonaws.com/sisaxu/87688632462.pdf
    • https://s3.amazonaws.com/silubebebefuju/99896907332.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/lesson_plan_template_nsw_primary.pdf
    • https://s3.amazonaws.com/woneketelak/aeronautical_information_publication_aip_myanmar.pdf
    • https://s3.amazonaws.com/sugosubexez/26210422292.pdf
    • https://s3.amazonaws.com/gisujubolidine/how_to_write_a_personal_statement_for_university_application_sample.pdf
    • https://s3.amazonaws.com/tobito/amma_audio_song_in_tamil.pdf
    • https://s3.amazonaws.com/joterige/pejupamakebo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin
51c05ce5a6cb561e941c8c3ec8ebf5402516dd72b9101c58ca1acabe40fd622a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 5284 bytes
font_01_sfnt_off00010385.bin
362b4a2bbfc7b33a497dbdde0ba703a37f6178fb39170c54d5f88a45953f93b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10680 bytes

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