Malicious PDF — malware analysis report

Static analysis result for SHA-256 72eea0fb09df32c4…

MALICIOUS

PDF

78.1 KB Created: 2021-02-27 13:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d996f02efb5aabf8bdccb56516970cc SHA-1: 8975cdc942d331c23c4cd84ea9415ccd9b4a22c7 SHA-256: 72eea0fb09df32c4d4525330c80761b63e829d69c8848a8e04c02bd6378db28a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content or facilitate phishing. The primary URL, 'https://nipisod.ru/wix?keyword=hp+officejet+6500a+plus+repair+manual', is presented as a repair manual, a common lure for users seeking technical information.

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://nipisod.ru/wix?keyword=hp+officejet+6500a+plus+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6023f0e399066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ff860c4f11c0.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/mugufevofexijusep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5ff637de9df0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_60387b7d9e734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_600ea7517b537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600be3dbd25db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fdf4d639b9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_602e2f4f492a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_600d89df6248d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fe04d52b7557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_600fce9e0d093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5ffa91f54923e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_6011dddf31626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_6035b66f33caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_6022d746a671e.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/viboxikuz/62509024408.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/professions_vocabulary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/glioblastoma_multiforme_medical_define.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5620 bytes
SHA-256: 2669d360cbf7ba88205557e6d583187c5f67cbd2688d4b84c6597c61d9edf356
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10548 bytes
SHA-256: 38f8befd47903fc386e55d1008f124800a5e496c867ee28bb56e47e1e959feeb

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