Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bcf28669c41126…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 01:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8db2705b72484f3113c5f6ad1aec9df SHA-1: 4787975e58bdd1c602a3aab6b98ebcac58487d4e SHA-256: a4bcf28669c411267a9ed9fec053f893eeae205db43deec6bae9ebc84ac77a73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful content. The presence of urgency language further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=the+elements+of+style+by+strunk+and+white+pdf+free+download PDF link annotation
    • http://johnmarzillier.com/ckfinder/userfiles/files/43862206945.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/vidonezedomam.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/83915252177.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/jamepujejowowasifu.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jiwez.pdfIn PDF document text
    • http://eternaseguros.net/files/files/ritarupeminobe.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///32683251508.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/38121518255.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/piwojefal.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/zoxigalakebetenas.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/kokolese.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/tosedumejixoniwelidigiv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417596c5c0f---lidixesix.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/27268626384.pdfIn PDF document text
    • http://candientushinko.com/images/file/novedo.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/vatexuzutoxuzimezib.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/53202909054.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jozikuge.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/67778361655.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wugadasizaxusejif.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/kegitozoto.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/16826074043.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zejesigizo.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/48542833940.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://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_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 17984 bytes
SHA-256: 095f32a729dc31d701e8555cddc95037a8415ab076758c80eddcb4fe7806a0de
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 11260 bytes
SHA-256: 08ca25f220748cac9842a7d7d2ff13d3c88d8d9713519a6a7829462f6474bd46
font_02_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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