Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c180877e10b34c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 04:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6830f43912784e87026cfdf202d31605 SHA-1: 5bfd4ea5ebd5e2103fe6f3c32b539cb7a52cddde SHA-256: 41c180877e10b34cadada41fd71113d4d9e0be4aae4553aaa132693061b8ec44
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, suggesting it is designed to exploit vulnerabilities or trick users into downloading further malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=free+download+video+converter PDF link annotation
    • http://safarang.com/basefile/files/17206722161.pdfIn PDF document text
    • http://kustari.net/userfiles/file/95499001169.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/82986641929.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/87946151396.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/sinaxesizikegafol.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/jazugonedugujexuvujib.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/356554261.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/ziwopejopobogupivabop.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/61373075876.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/sofuvekudipeteliruwelop.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pazoxiluvol.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/34656665882.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/repezaj.pdfIn PDF document text
    • http://rafaelokazakov.com/file/40419836141.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74488824526.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/83194577468.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/83553130024.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/miguxixinodi.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/logigokun.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf912fe1f---31094653884.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/8113751812.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/18325720312.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/domilimoriguxonipakajenom.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/68484209043.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f279e1eebc---71797156853.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16312 bytes
SHA-256: 1c7337419e262f0f4b7a55509ca1d6d240be012a126f15d0ca80dce6752e60cf
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10324 bytes
SHA-256: d0d792aa0dbdea790eae9fd29cb1a565cdcd07ecfa10015667f5832def6a5360