Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c4fafb6a737c4…

MALICIOUS

PDF

96.8 KB Created: 2021-03-04 12:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b030446c33f545929a0c24685e06d34b SHA-1: 67dd5e6a806d790a0b3ae344be100d6cd9dc11e5 SHA-256: da2c4fafb6a737c4ff7d105e82270f4e5cd278230036aef696ccda3bc70cf801
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. The embedded URLs point to various domains, some of which are associated with link farms or potentially 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 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://maypoin.ru/strik?utm_term=pathfinder+adventure+paths+ranked PDF link annotation
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/1404324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_601b07a9c32de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5ffeb43ff1cc6.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/bafesawofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_60102a1d282b7.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/6c32910386b.pdfIn PDF document text
    • https://pixogujoxekame.weebly.com/uploads/1/3/4/7/134715770/1145219.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/android_one_9_mi_a2y89mp.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/904590.pdfIn PDF document text
    • http://bloodcraft.online/71761819961wqt8w.pdfIn PDF document text
    • https://zotawirimatoxo.weebly.com/uploads/1/3/4/0/134096886/1c9ff389.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/lolijexejomak/250740851.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/equilibrio_estatico_exercicios_resolvidos.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/angielski_matura_podstawowa_gramatyka_wiczenia.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/post_office_nsc_withdrawal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/albertus_nova_black_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/mujopowoxe.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_off0001406c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 5220 bytes
SHA-256: 030288440f1ced1f2078af0ce106e158b6dda19906a7845c27393bfa094f903e
font_01_sfnt_off00015232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15232 10616 bytes
SHA-256: 740ea7e759b39f4a449ac3c042520fc3b6b8684734c0378fc0e411a956ff3b45

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