Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e6909ad8983706…

MALICIOUS

PDF

78.2 KB Created: 2021-03-13 13:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0625e9fcabfcecbbde56349f83cf8e29 SHA-1: d474dd1555b44caf3f04b9c636bae79f19fcea50 SHA-256: 21e6909ad89837060234bf9b3691f3ba3c9cf6a35263b2d5009a41f955cbbf12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=zoom+h2n+handy+recorder+battery
    • https://cdn.sqhk.co/burexewejam/zCDhhUK/7506156169.pdf
    • https://cdn.sqhk.co/pawiwodogu/e8iehjC/95854017543.pdf
    • https://cdn.sqhk.co/tolebilu/gjhfIig/73136895249.pdf
    • http://galirugubosel.iblogger.org/vorijipezeza.pdf
    • https://cdn.sqhk.co/wozulifudon/ijhcRja/61114719371.pdf
    • https://cdn.sqhk.co/kitaparek/hhhiF5q/83691711133.pdf
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/kixifezakis-gatodepota-zotit.pdf
    • https://cdn.sqhk.co/gagowuname/bjgUDVV/detention_lyrics_melanie_martinez_meaning.pdf
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/lifed_magerenegidudos_xuvupilaziwepas_bedoxonaseb.pdf
    • https://cdn.sqhk.co/gikunixa/e7mgigd/castle_miner_z_free_download_android.pdf
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce924db2b78.pdf
    • https://cdn.sqhk.co/belexewuwif/ciaiiii/nejapalevawuj.pdf
    • https://cdn.sqhk.co/dexizajifu/gifHgjn/diep._io_hacked_client.pdf
    • https://cdn-cms.f-static.net/uploads/4448549/normal_6048f12e10854.pdf
    • https://cdn.sqhk.co/kapideto/jfYVBhe/64084595397.pdf
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/fizagusobud.pdf
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/7e012dd070d44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bifapekedareb.rf.gd/xanujaderunux.pdf
    • http://juvumutat.rf.gd/lonunesobiguwebaxu.pdf
    • http://zosajirigo.rf.gd/rutezisunexolobe.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_off0000f16a.bin
c0da11dea660c8fdda7c0fa0a2b53c1a5075fd4bb2b0835819c8fbc87c7a24a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5300 bytes
font_01_sfnt_off0001034f.bin
49a41e662cb998cd1ab57e46ed4e380755d1b59a198a6d8f276c8f35315d234d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 11856 bytes

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