Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbf6bf4935a27f9…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 17:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f50bd241ce892d70ab6fcef43ac9bd90 SHA-1: 0447f882f4514c3d0410782ed40fa973aea51c2d SHA-256: efbf6bf4935a27f9213643956592a7478b20dd584d72f8789180a88e5b73e364
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link to a suspicious URL hosted on a disposable domain, indicating it's likely a phishing lure or a downloader for a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of a link to 'www.sunarnuricomuisvealisverismerkezi.com' and the overall structure point towards an attempt to trick the user into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://baxsporthorses.com/userfiles/file/nudagitip.pdf In PDF document text
    • http://golfvillageonline.com/userfiles/file/8496947265.pdfIn PDF document text
    • https://brakos.it/file/93759704222.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/57078390070.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131385b02b55---jepomupipadipi.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/96375654630.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/ridebefobawavovoguvobo.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/99918929290.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/58183848977.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/diwitibak.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/jusexunixonikipusuxopopos.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/81564923448.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/tivetadajemomemotopape.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/6105771081.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/kotebuxud.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jifuligikiduladubikuluv.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/wefodudito.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/monoxefefisokomafanejupan.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pomoxopa.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/jaxav.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/taropujadokirubot.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nsoddk2973dabkeui9qqmkti11/mafuvilenegux.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/difibasaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+block+inappropriate+websites+on+android+phonePDF 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_off0000ae54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 14180 bytes
SHA-256: e54dfc3b5fc593221f2e97b24b8df70b263912745ad16fbf59eb111c76b29e71
font_02_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10920 bytes
SHA-256: 0667127bff648e8a15be48dfa49b807f765f55e01f0fdef653834d34a81876a5

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