Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef282552a11fe5a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 10:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33f6561115238773237136b720c1eb09 SHA-1: 9f8eadb3dbf02f9675c2c84869ed92abe85d5654 SHA-256: 9ef282552a11fe5ac610a73afcb833570fb7b7963c3279e32e6e720b5f3c6b3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the presence of a QR code lure and a visual download button, commonly used in phishing campaigns to trick users into downloading malware. The document also contains numerous embedded URLs, many of which point to suspicious domains, suggesting a link farm or distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chinhsuasolieu.com/media/files/76258110581.pdf In PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/wizijipolomileretifude.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a77bae3f55---89725270552.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/buzibonawijawexozebu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/79019426781.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kelisoxubobodara.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/60106444316.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/bifolivup.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-12/images/files/rujalizozos.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/38666646897.pdfIn PDF document text
    • http://www.andreapondika.cz/file/gesekikijenatolotupux.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/fufiludu.pdfIn PDF document text
    • http://vhktn.at/images/content/files/fofakofumuduki.pdfIn PDF document text
    • https://jss-moms.si/upload/File/66965494996.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/mapegapisifozukewomobef.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/30902267488.pdfIn PDF document text
    • https://asken.as/bilder/file/tolebinukerunebe.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/24340634753.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210917200147523181.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/24490155883.pdfIn PDF document text
    • https://shibbirs.com/media/files/72064489296.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/79345282711.pdfIn PDF document text
    • http://vanhacollection.com/images/files/4496278780.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/lobomijuxe.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/nubusumegagodar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+shareit+from+android+to+iphonePDF 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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 17392 bytes
SHA-256: 5f2d5245a027f820b11c55977062e7501475a6ff0bd080b444a5cb48e4d51efc
font_01_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 10792 bytes
SHA-256: 399de4fdcd8a7c11ccd828f7a355a495a3832b13c4f846129248b19884d7c0f2