Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33761047ee291cc…

MALICIOUS

PDF

75.8 KB Created: 2021-05-21 17:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ac4c36779ef5054fb860cfdc794bc89a SHA-1: 8584c0fe5e6c685ebb99cea9de484d3cea0fd518 SHA-256: a33761047ee291cc4a53ea82789f6db7a5008e0d411fcee32fc0e301a488f766
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The primary malicious URL, 'https://seumenha.ru/strik?utm_term=sociology+notes+in+hindi+pdf+free+download', suggests a phishing or spamming campaign. The presence of numerous external links, many pointing to benign PDFs, indicates a strategy to distribute or mask malicious activity through a large number of seemingly unrelated documents.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=sociology+notes+in+hindi+pdf+free+download PDF link annotation
    • https://palejuzuz.weebly.com/uploads/1/3/5/9/135959315/davuz.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/663b70f6f6f39.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/gafomujamos.pdfIn PDF document text
    • https://pozajuraxox.weebly.com/uploads/1/3/4/5/134591712/a2bec4cc980.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/5660303.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/fusidejebi/calculus_and_analytic_geometry_chapter_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dcc5d9d-b82c-4018-b7a2-c9884cb3281e/juzovufaralovulilox.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/sufedobobega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15adc8b2-cf3e-4fc6-afde-ac8d5b3fb600/29217495650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff27da8-9848-4972-96c1-e18404b2db20/21047078029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601b50f3-167b-4249-bdf2-734277d2aa65/guxijagubevereriga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274d8a2a-879a-4fdc-b1c7-3dbb56e1f2e7/bimosogeduzovivaxesez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0905abd3-d4fe-4ef2-ae1b-801867075869/data_mining_vs_machine_learning_vs_data_science.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/34175732534.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/mukuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69924062-2dac-4753-a7a9-d5cce8d6dee9/zanuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a64fe4-861c-46d4-97ab-f8b85e331230/kojituzimutabuvowor.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/wuboxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/pelepo.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/81643385287.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_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 5716 bytes
SHA-256: 0d397aa0bc8369c885be64e2bd25c8b8bd41d070ce6764b8f2a5c5bad395e917
font_01_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 10652 bytes
SHA-256: 8c5c734f024a6eac9251c9a45df5637cb60d8a1a7830ef3d0d9413f92877ac39
font_02_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 16336 bytes
SHA-256: 70a14e0d3b96815a4cc105cd0ebd44f630d556efc7362d149d49b2296f6d5599

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