Malicious PDF — malware analysis report

Static analysis result for SHA-256 a050726ca929ad30…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 15:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64dd160f476da7a69adc1209ee092557 SHA-1: 8f03001626ec730e12c799d1e2d9d77a7da2db13 SHA-256: a050726ca929ad30163794a0e79b0cf4b43a56c6c9c4f832e62742bff81eee75
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination or distribute malicious content. While no scripts were directly extracted, the presence of numerous suspicious URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=ludo+king+dice+hack+apk+2021 PDF link annotation
    • https://swiz.eu/files/editor/mokufimikovuneputufemolu.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/bulenixodepegowaxaxomed.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/97727620201.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/3017732764.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/24641638112.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/15736396697.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/berodukekodob.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/14312143245.pdfIn PDF document text
    • http://sciattella.net/images/file/fadifunex.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/92541138641.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b0a46bcb---52863174437.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/gefarov.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/69305024261.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mamonabiguzazurebiwixam.pdfIn PDF document text
    • http://podarox.ru/public/files/57651416096.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/6549738779.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/9506820798.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/zutumibopurofutazivozab.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/zipexo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/59169793470.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/43010933849.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/46987451055.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/pototaz.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_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 18132 bytes
SHA-256: fcd5e3aac6206852692858d2477c40d86a80f02d51b98ea150e60a919cbcaad0
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 10824 bytes
SHA-256: 7517b944755ed6afd7dcf0a93703fa56fb212900569f38737d42bdbb61ab2d5e