Malicious PDF — malware analysis report

Static analysis result for SHA-256 1275ba08feea5f51…

MALICIOUS

PDF

79.7 KB Created: 2021-10-10 07:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1d69d93b8c768d2802acfc291777ff3 SHA-1: 35c7382bf3cf973f56860b1743b0a633ffcff216 SHA-256: 1275ba08feea5f5101ae2778ba3bc8e1ddbf8f57e0589dc14db7bc93fa5c887f
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. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' further supports this conclusion.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stmrcstvm.com/userfiles/file/baruluned.pdf In PDF document text
    • http://studiozoppini.com/userfiles/files/lobegesoroket.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/29627515388.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109270853089152.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/zinufevibonobobirujopox.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/42242199567.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/75171583880.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/gaguwogipa.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/lirasa.pdfIn PDF document text
    • http://aurora-c.jp/files/files/25024132957.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/80066627242.pdfIn PDF document text
    • http://webursitet.org/Files/file/17719584217.pdfIn PDF document text
    • http://apsons.eu/files/file/pomonifenuzizemavukimek.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/zakigadifuwefilada.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/15617855464.pdfIn PDF document text
    • http://bastola.org/userfiles/file/26939204645.pdfIn PDF document text
    • https://greenways.at/userfiles/file/69552338458.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/kimasedekidebosox.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/68455380404.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52979382764.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f123be36af---pewogujutedesitopezizebim.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/buzebeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+open+tif+file+in+pdfPDF 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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 19336 bytes
SHA-256: a744165d685bf5f88cd8846fd51a1755e87e00e2a2a65a6ca12369b30002f9e1
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 10136 bytes
SHA-256: 4c464f68d7391fc5dbc7da4bf1a7d639bc6f7341cf5d48991227084062754d07

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