Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0547366d915a4fc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 02:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5d6dda38cd9e410775c930525824d44 SHA-1: 38f60fc6619757e645319665f2fcc904dfc038dc SHA-256: b0547366d915a4fc177bf5462c08aeb4f29cdc545697f4435efe427e12a37e77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are structured as a link farm, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tv-sat.cz/userfiles/file/wojoxarojitazabir.pdf In PDF document text
    • https://icon-studios.com/userfiles/file/golafuvujo.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/80350027366.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109200516529853.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109140544136777.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff959b4b3---29706162003.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/60490674625.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/xafubesuxefof.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/ladekobutivokax.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/44156781055.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/60281232388.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tofemakelixa.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/81425061516.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50968951513.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2e9a4720---gefaxogefukasuk.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/52312230822.pdfIn PDF document text
    • http://kleiberit.ru/files/file/mibusonaw.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/7221381828.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/40312520010.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210914160104.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/bufelulirepa.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tedufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=plague+inc+evolved+download+for+androidPDF 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_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 10636 bytes
SHA-256: ad5505aeea069de073cc9c3ccfdb0efeb86d3bbc4619fadf2876f910dc1281db
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 19164 bytes
SHA-256: 5b0e1ba7f5e8e66d619396fc9ce83fd5e4f411e66087393cfb910f2478b4019d
font_02_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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