Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b0dcff2658cb5e…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 13:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 962c2dfb626f5812cf60f507f8d5f569 SHA-1: 7a7ed5bdca9b8a183fe3df899897bffba0cf9547 SHA-256: 37b0dcff2658cb5eb2690c0d659d236fc1cbe715fce69f6c950ff9bc6649ecc3
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable links. The presence of numerous external URIs, many pointing to disposable domains, further supports this. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 63 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ohappy.org/userData/board/file/romapajajemo.pdf In PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/33684019292.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/xipulobak.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/79c371d914761b2d5d48a50892c3f12e/tupijisokadisi.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/33198328255.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/50626624084.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/jujedagilubopus.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/11998716882.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wenifep.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/23662064169.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/80jgtrsmaj98l0m0qr8fthk338/wopasataxisakatola.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/91724504404.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nefawopoxonakopez.pdfIn PDF document text
    • http://flardochform.se/userfiles/file/45811335181.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/34536056305.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/filadejilu.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/88699004026.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/nalanesamokurineg.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/lojosukowaju.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/detuzow.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/12974457072.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dusesuworibap.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/79357018246.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jemuviziti.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/92421217898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+versionen+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34A 10276 bytes
SHA-256: 480a8d12a7a98ae23dbc655d43df77516242fd0452d0ba3e9fef993025193580
font_01_sfnt_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 14204 bytes
SHA-256: f6b0f0a488bbd4e7a523d8d4ec29bd767731808534a00d4315935e27fafa1ea5

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