Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b9dd4c5d734026…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 15:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 955b0f5fd8cd5423c069a90a3d6fdab0 SHA-1: f8ce3d706360caee6babfb9aec32f34457ba38f9 SHA-256: e1b9dd4c5d7340261554a10668e9c3d0380744588010b2099f71db71106bc3f4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it's designed as a link farm to lure users to malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a tactic to distribute links across many domains. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://groupburuemas2.com/contents/files/jarevuzo.pdf In PDF document text
    • http://auburn-companies.com/userfiles/files/wumitufexaxekatebol.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/84721310896.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/fajutafugavepapumerev.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/metetakasenokofojawejawal.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/67643924234.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/90627812415.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161354292b95fc---meloburodolukobonosaj.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453834594c5---xusufiv.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/pipulabatarajo.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/46471969835.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/34854670133.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/terigesezilusunoxafeto.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/98201650133.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/momorikagoneme.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/bexudawijifofifoz.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/4056372693.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/divoxenivu.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mabet.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/71500421821.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/83409447314.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/51497082462.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109061150402429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pes+2020+football+game+downloadPDF 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_off0000bd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4C 16332 bytes
SHA-256: 082f2094f039b75e74f6f8d62760e967e919ef069a0bfc34ca720570bdc43a97
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10976 bytes
SHA-256: 0a657e790d0c6e5b6f96b5928603ce4149218b1884d8719e7c3aacd1121e0c03
font_02_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1