Malicious PDF — malware analysis report

Static analysis result for SHA-256 c587fd5fbf503c49…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 06:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 053badbb835c8c988df4038ea9741ed4 SHA-1: 5f8a2b1f5f2fd0beebe150c2df0b2fa68e311921 SHA-256: c587fd5fbf503c494ec1895ee81afe2db8d5cbf197e48267a57400f349e3c5c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, indicating a potential phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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 http://apart1day.ru/file/37167280388.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/wefifilukutuguxefe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325cf2cf1fb---dunafuvasiradabo.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/xatuminu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/39044639030.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/taxagogokatexux.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/senelogop.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jikekeluwakitur.pdfIn PDF document text
    • https://begili.com/uploads/image/files/94762325143.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/45297957437.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/kodetefodis.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/93ab5f8e5331e677c1c37ce03ec0aef0/vebalebenazamumirenibuk.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bufusekovipetirug.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/76277193586.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/zarexi.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/22628704786.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210903063211.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/waxoririmegawosituwe.pdfIn PDF document text
    • http://symbolfoods.com/files/file///69107887519.pdfIn PDF document text
    • http://glassick.com/userfiles/file/dexovuxitivofuwur.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/rodiwagimoko.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/tunupiroliguwibuzep.pdfIn PDF document text
    • http://446888.top/userfiles/file/tuberebevorojuti.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dezuluxinisetemipivavewol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=recover+deleted+photos+android+with+computerPDF link annotation
    • 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 18068 bytes
SHA-256: fbf6980c67bf9869157e52a871308ac321da9c3473f0a60766791b5224d30f10
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 11076 bytes
SHA-256: 8d75c5f80c6924c8516d8ff4351d2fc18d31b90e93488ca122249af819ae9069

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