Malicious PDF — malware analysis report

Static analysis result for SHA-256 732d8b2397dec09d…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 03:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f17c196012148e378f3a29a28ec897d SHA-1: 7d92fa248fb0df1471ff0cb34bbc23fe0dcae16d SHA-256: 732d8b2397dec09d9fd3036fe99fbdab43ccda4578d012c5f00a2bd53e37332a
230 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure suggesting it is an admission form, and it includes a critical heuristic firing for a malicious redirector link. The presence of numerous external PDF links, some pointing to benign content and others to unknown or malicious infrastructure, indicates a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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
  • 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://gettraff.ru/aws?utm_term=admission+form+of+punjab+university+for+bsc
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5fbc1105d2ae6.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdf
    • https://cdn-cms.f-static.net/uploads/4486041/normal_5fad91f031b1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divexikav/the_backyardigans_tasha_shoes.pdf
    • https://uploads.strikinglycdn.com/files/c13a01d1-525a-44e8-92ff-c6da54821fdb/service_level_agreement_management.pdf
    • https://s3.amazonaws.com/metakibeme/molilaxukudo.pdf
    • https://s3.amazonaws.com/lijulijowivaze/fadux.pdf
    • https://s3.amazonaws.com/tobaziw/mixed_vascular_malformation_brain_mri.pdf
    • https://s3.amazonaws.com/polexebuj/downer_edi_limited_annual_report.pdf
    • https://s3.amazonaws.com/jebokizez/preguntas_ser_bachiller_2017_resueltas.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_off0000cba7.bin
c3a27dccedd114c6a889883c05f360afe9c42c05443e34cd88cacf8b627b4122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 5636 bytes
font_01_sfnt_off0000dece.bin
6187512c7c2b6c0dbfff3ba6bdaba6eab9eea21cd45aa60555f8d2ae937cc844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 11340 bytes

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