Malicious PDF — malware analysis report

Static analysis result for SHA-256 5138e0e8c5aae64a…

MALICIOUS

PDF

92.1 KB Created: 2021-09-20 03:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ce70a839b139f9f75fa1edfec4a25ae SHA-1: c95665f0e527ceb3be0019b9e2f68892e9e12cd4 SHA-256: 5138e0e8c5aae64ae2296c7e65c3267f8ee7ad5084373d909fa90864ce2c135b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous embedded URLs and the 'Password-protected archive handoff' heuristic indicate a likely social engineering attack aiming to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's part of a phishing campaign, potentially using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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://pixomot.ru/uplcv?utm_term=libro+contabilidad+de+costos+neuner+pdf PDF link annotation
    • http://shangyi-pump.com/uploads/file/170737435762.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/85533991570.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/23143867155.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/45405048815.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/zaxoduzidapumerurofanu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/pewumumit.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/17832173408.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xekenijijofit.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79642893044.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210917034738.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4d8e2281---liludugovexotixif.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/levoreli.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/55192622029.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/77546237407.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89968567277.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/36832933185.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/93006589187.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/91984745998.pdfIn PDF document text
    • https://limsurempat.com/contents/files/59270194903.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/wofujajuredeleride.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/25533047815.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911104805281018.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/bafelimugozomas.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/71304540573.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_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 21108 bytes
SHA-256: 96318b0997ca784a4a119188a2eda443ee90ce5024b760284fd620f57010e050
font_01_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 10812 bytes
SHA-256: 03d8dd721989261994091635170a087a8b0060371910ae2f53b737182b11f32a