Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b428f1cf126ecc3…

MALICIOUS

PDF

68.6 KB Created: 2021-02-21 02:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2094015d572154334f054406865cd300 SHA-1: 49509caa1dd7d4854b145a90ae8879f557f620c2 SHA-256: 7b428f1cf126ecc3eeefe41c48cda50a1abb3c578c04fa892ec016bc5ae8d2f4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to these malicious URLs.

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://bologen.ru/wix?keyword=finite+geometric+series+worksheet+answers PDF link annotation
    • http://swiss-gear-top.xyz/12103392067l7n7f.pdfIn PDF document text
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/vivoweguj_xelajuguwivupug.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/fidgiFi/30371389503.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/b41336e.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/5939361.pdfIn PDF document text
    • http://2220202.ru/97954568160p87bf.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/html_css_photo_gallery_templates_free.pdfIn PDF document text
    • https://xupovefodifej.weebly.com/uploads/1/3/6/0/136053951/a33ee63c9e2537.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/ShcBLVe/kojusonunozuzakubodawibuz.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/1388fd6c75c9.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/bodajaku/mivizunowukelufunapivo.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/42447606046.pdfIn PDF document text
    • http://bezakimodetores.rf.gd/konisowako.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/the_things_they_carried_characters_martha.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/36573077267.pdfIn PDF document text
    • http://rexawisoza.epizy.com/33719567431.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/bootstrap_responsive_admin_panel_template_free.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_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 5292 bytes
SHA-256: 8e10d425fa5f19622d51411db56df13db964092a90afc18f8cb04a733854da87
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 10220 bytes
SHA-256: c3b6b07cb20b1054f8609caef051143ca644ed823f3409dfb8453fdae1748542

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