Malicious PDF — malware analysis report

Static analysis result for SHA-256 c629bb28c050543a…

MALICIOUS

PDF

71.3 KB Created: 2021-03-02 14:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2d56a893be859a7c8063027e5965592d SHA-1: 9cd55557ebca3b2c48520315e1c0962782f79ccc SHA-256: c629bb28c050543aa7222006e7d217aacc7a1413df6747ff20c31fee7f7799a0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs, even without explicit script execution, points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=what+is+the+best+class+to+play+in+diablo+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5ff171f3a8340.pdfIn PDF document text
    • http://gelchlen.fun/bombastic_synonym_for_beautifulvtgvy.pdfIn PDF document text
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/2188c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5ff508bd154f6.pdfIn PDF document text
    • http://makukenumeg.22web.org/177_mental_toughness_secrets_of_the_world_class.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_602d2f826a0f4.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/sanex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404299/normal_5ffaec8e638d7.pdfIn PDF document text
    • http://dusefibesix.iblogger.org/sore_on_leg_wont_heal.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/jotizifime/major_general_song_piano_sheet_music.pdfIn PDF document text
    • http://xidatozekef.epizy.com/centos_7_epel-_release.pdfIn PDF document text
    • http://jusaxokipumata.rf.gd/bulletin_de_paie_explication.pdfIn PDF document text
    • http://melotaroluna.epizy.com/wirowovujenulovi.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/muditorafumubenalavu.pdfIn PDF document text
    • http://noxudovo.rf.gd/36061509624.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 5484 bytes
SHA-256: ca2b407aff95b574c5b5979ca6c5922e1d8d36f04010c69ad39931bec9671040
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 10164 bytes
SHA-256: 11ca2bc317a26f8e9f9c169a40742e8861be842ed772ec645066ab6678b5b669

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