Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c83400e3870466…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 23:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b616c470bca724c33449d8cf32f5b46 SHA-1: b3d84f3a2eb269ad561bc88c7b55206553c01b58 SHA-256: c0c83400e387046634115e4388f8dc80d6ce4e0cd90ef793579404f5f558960e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to citation and PDF metadata, suggesting a lure to trick users into visiting the linked sites, which likely host phishing content or malware.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/award?keyword=cite+pdf+mla PDF link annotation
    • http://xemisudufi.iblogger.org/66430606736.pdfIn PDF document text
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/0a7b21ca84a9b78.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/pigiri_wuneni_zutopomol.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/39196845708.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/70107beac8.pdfIn PDF document text
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/rixitav_mudomasulir_jekenibupe.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/7551882.pdfIn PDF document text
    • http://zaduzoronogikex.22web.org/74557389683.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/45719762381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badamowafe.onlinewebshop.net/al_qur_an_dan_terjemahannya.pdfIn PDF document text
    • http://redusaboj.epizy.com/kundi_much_song_video.pdfIn PDF document text
    • http://gifagedopodub.epizy.com/59067909083.pdfIn PDF document text
    • http://ketaxesam.epizy.com/mso_001_sociological_theories_and_concepts.pdfIn PDF document text
    • http://tetaduzebeturap.rf.gd/88190324448.pdfIn PDF document text
    • http://piwiweranewu.rf.gd/69014839055.pdfIn PDF document text
    • http://pikosugurib.rf.gd/ivan_ilyich.pdfIn PDF document text
    • http://towirasoruxapob.rf.gd/django_template_if_statement_not_working.pdfIn PDF document text
    • http://zadupomepinedo.rf.gd/mesorijaxenosuruwu.pdfIn PDF document text
    • http://ratebasazor.epizy.com/rolijerisukigidadube.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/63132893306.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_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 4816 bytes
SHA-256: 6b16ac6bc43518c2e3673692a1022ad1c35b02b02f133a005a567474e43623a7
font_01_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 11276 bytes
SHA-256: 0562087d44410e89212aff50c580aec9342c06e2ddbe933ae75f5ebd5362bd26

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