Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00d587a6300becb…

MALICIOUS

PDF

70.2 KB Created: 2021-02-27 17:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ad71fe7ddaae662a8e252da97e0c45ca SHA-1: 566e02377003e028b7eec62e4d7dd71c8c69a7ac SHA-256: d00d587a6300becbb5a1813c0be6a47c8920bfb3adb1edb371ab8dc94978e4cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to distribute more malicious PDFs. The primary URL, 'https://vilenefex.ru/wix?keyword=radical+review+worksheet+algebra+2', suggests a lure related to educational content to mask malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

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 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://vilenefex.ru/wix?keyword=radical+review+worksheet+algebra+2 PDF link annotation
    • http://vashmaster.info/59664190195eovdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_603a00de0c1a6.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/biwigavajuj.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/0Ejficy/digi_online_store_limited.pdfIn PDF document text
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/vupujipus_jevizinetop.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/nTDGpig/10955199902.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/Gw3gjhg/nursery_rhymes_songs_list_uk.pdfIn PDF document text
    • http://bazis-rostov.com/98506528313oj44x.pdfIn PDF document text
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/96e186dc9dd.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/kilivesimuvusam_wivovifujepisis.pdfIn PDF document text
    • http://lenudes.com/xuxedodazaxobemesuwomemis455mi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/fubijizale.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/alsynite_translucent_sheeting.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/bujokag.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/makovatizaxoxomazun.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/2425591765.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 5380 bytes
SHA-256: 1fe685ca1613d09b360443310f2e08c3cabe4e69e6d76841596fcbbe67e7f5a7
font_01_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 9860 bytes
SHA-256: 51ed1c55e6a12c8ab7cb70ffdb04362e89ef4bd466fbc43b151eecdef6be2e09
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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