Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc9af3273ecd273…

MALICIOUS

PDF

73.4 KB Created: 2021-04-13 17:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20b45ea44032bc24c28f9424a81b4e4 SHA-1: 20cc143020f83231d661bcd2885ccb1ac046cea1 SHA-256: 9fc9af3273ecd2733bea95b81ba2a9024ffab21af338e3204fd230b3e5ba961d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=what+is+patient+autonomy+in+nursing
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/vukubek.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fdb669d4ca8a.pdf
    • https://cdn-cms.f-static.net/uploads/4476416/normal_60282582934cf.pdf
    • http://siwosupegejolop.medianewsonline.com/partially_hydrogenated_vegetable_oil_trans_fat.pdf
    • https://gaturipagi.weebly.com/uploads/1/3/0/7/130739573/98f7edb.pdf
    • https://zezebeburopixem.weebly.com/uploads/1/3/5/3/135326834/ratekonora-rumesomito.pdf
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/a9220e89.pdf
    • http://wuramegojuluz.mywebcommunity.org/70316797655.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_34fc7e4e75314da1a71326bd25a68ff7.pdf?index=true
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_906fcb17b8404e39a93b09b0fc814fc5.pdf?index=true
    • http://gefuwaw.atwebpages.com/2179606023.pdf
    • https://uploads.strikinglycdn.com/files/1ce67b82-fc85-42f0-88a9-c97621e64472/gejebojoxulojelutunefe.pdf
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_a53a2880fdbf4c95be2437ece9cb729f.pdf?index=true
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_694e189cc1234cafbf544a7a3429f729.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2847b71c-1527-4c3c-af81-c55980cab578/how_to_remove_petsafe_collar_battery.pdf
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_cb630acb7bd9408fa6878a7585b07677.pdf?index=true
    • http://pebomotixot.myartsonline.com/alkaloidal_drug_assay.pdf
    • https://uploads.strikinglycdn.com/files/e366623f-e2c6-4b27-8b02-2b557a34694a/dafoxa.pdf
    • http://bivojeda.atwebpages.com/zejufixukekojatefola.pdf
    • https://uploads.strikinglycdn.com/files/30abd8df-1d3e-4106-9c28-c8d6e725c673/55968037611.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e223.bin
78017a262bdc4a0d27ab6eb0c693ff90393956b821d225ab7bbc8f0aec1a2182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5316 bytes
font_01_sfnt_off0000f426.bin
595c1269d4a0c085a708fda39d7b9693b4cebc7dcc70c2e8addb32cc60ea8c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10716 bytes

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