Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c6216341a6414d…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 04:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 998a81d71e6e4b9da5757fb68ec3e6c3 SHA-1: 5c2d1abca2a63dfb8c6f2dbc5f36351a23b5c74e SHA-256: 93c6216341a6414d5dba4d0e468abcc60bc6a845a07761095c97ae3ad5d32742
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as academic syllabus information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure itself is designed to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=bsc+computer+science+bharathiar+university+syllabus+pdf
    • https://cdn-cms.f-static.net/uploads/4450040/normal_604320479aec4.pdf
    • https://static.s123-cdn-static.com/uploads/4450870/normal_600256242ba13.pdf
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/soxekoxijixogidutuvi.pdf
    • https://vutuwibomakupir.weebly.com/uploads/1/3/2/7/132740747/jenupod.pdf
    • https://pasiwuguvode.weebly.com/uploads/1/3/4/6/134601834/1703020.pdf
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5ff1927f9645d.pdf
    • https://cdn.sqhk.co/burajugi/DGggiia/97634636051.pdf
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/5748783.pdf
    • http://zesozidim.iblogger.org/zezebawavi.pdf
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5fe694f79260c.pdf
    • https://static.s123-cdn-static.com/uploads/4369643/normal_5fffd9d4941aa.pdf
    • http://pelobana.66ghz.com/8222561204.pdf
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5ff5d0659da1d.pdf
    • https://cdn-cms.f-static.net/uploads/4384480/normal_60141c771b25c.pdf
    • https://cdn-cms.f-static.net/uploads/4384655/normal_605f8d6763232.pdf
    • https://static.s123-cdn-static.com/uploads/4368479/normal_5ff9fff142e81.pdf
    • http://zuxegizo.iblogger.org/textile_wastewater_treatment_process.pdf
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/d87f12.pdf
    • https://cdn.sqhk.co/muzubasiwu/erie72t/plague_inc_premium_apk_revdl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://97ca8ee5-9e40-45cc-bd46-7bc1f23d59ff.filesusr.com/ugd/112b0f_466c4c5d64bd46e4807247281d26c75d.pdf?index=true
    • http://vekibavekuje.epizy.com/kokebo.pdf
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_2a3a683d640242fdbc07f4d23bc8fedc.pdf?index=true
    • 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_off0000eed0.bin
1062e530461476a422de6b67ca684f8b9b5b8e3cee2e1a4f2427c63fd906c254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 5744 bytes
font_01_sfnt_off0001023b.bin
6fc3341dbc0a40948b1ea051dff35e4b0317538be63492c26e0496570c71bb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10720 bytes

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