Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e6c914ee20d5ed…

MALICIOUS

PDF

90.9 KB Created: 2021-03-16 16:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 63e8f84fe7f4eca68cc687c5ddb019f4 SHA-1: d3483d928818899894bf27ba4dcdbc55cb759ba8 SHA-256: 41e6c914ee20d5ed02e66060fc67cda209e6b4a94d0de1501e90dde055d7a85f
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to manipulate search results or redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirming this. The presence of embedded URLs and the 'SE_URGENCY_LURE' heuristic suggest a phishing or social engineering attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=gloomhaven+scoundrel+cards+pdf PDF link annotation
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/jodiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_60047b5e1797a.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/7694521.pdfIn PDF document text
    • http://tirudibemaj.22web.org/bufar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_603854e0dc34d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479905/normal_5fca9bb9877de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ripazek.epizy.com/geelong_bollards_information.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/jolobigawogijufemobaxebi.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/serious_illness_conversation_guide_ariadne.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/348369073.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/90863969394.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/xowedimi.pdfIn PDF document text
    • http://lezegunotoxom.rf.gd/academic_calendar_template_2017-_18.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/curso_ingles_basico_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 5484 bytes
SHA-256: 160d4db5bf7f16fc167edb8ce7930d0b2f9e386344e9f1c4c99bdef4701efdbe
font_01_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 10616 bytes
SHA-256: 2892a140264d34e19ddc7a312bcd8f4c0787e60c2804b57b1f5bfa51940afe8f
font_02_sfnt_off00014885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 16380 bytes
SHA-256: 970252b3315b5fa24618e4e4486089cd80d2ae6ee80e3ad54fc29c596df9b3dd

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