Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd1a1f03abc2ece…

MALICIOUS

PDF

88.5 KB Created: 2021-09-14 08:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1ce976efd1f94f9b109fd9de14af692c SHA-1: b27757229dd45ad6b92909d2fe042e1bb16c9940 SHA-256: abd1a1f03abc2ece397de58af25f187bb25b5fa43f9dd8ac9a8847e7088fe426
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=physics+practical+pdf+tamil PDF link annotation
    • http://technimexvn.com/images/ckeditor/files/gukisotaje.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/24111092562.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/gizobebif.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/53067987589.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/71470439870.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/69886136571.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/94870666271.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/4581194781.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zazetufemijifilaw.pdfIn PDF document text
    • http://santabruna.cl/upload/file/wetodufavewoxikafa.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/56067220599.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/92329517918.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130306638e03---xekukewegelax.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/45369139048.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/47984710826.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/kegidodofotive.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/janumififosov.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/71920901d0c33ecbdb66f172cb0a20f5/83541018039.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/feneb.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/sutakut.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/wegixa.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/18797172029.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/15766765398.pdfIn PDF document text
    • http://eva.am/files/6120686002e8dc63.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/ninako.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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 18644 bytes
SHA-256: 8f49bca182f980c3dda86be9c010a0f27eef481b1883b0b244b82c02f8a31289
font_02_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 10644 bytes
SHA-256: 07ce0b1aae8ccbc7f4fd3250110ff604ca930d38ec3107b0142cc1a24f8b9739