Malicious PDF — malware analysis report

Static analysis result for SHA-256 c722f8358785fc91…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 05:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb03f85d50e99d34881fb1c3528ed0aa SHA-1: dc555cf6fb125dd6ef2961b3773f62f1b1da13df SHA-256: c722f8358785fc9194c347c335d2bd41266e123a4cfc0dca0c181bf6966f43d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document's structure and embedded URLs suggest it functions as a link farm, directing users to potentially malicious sites under the guise of providing free Android games. No scripts were extracted, but the presence of numerous unknown URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4015a9623---kuxifadonenawuvezezivagu.pdf In PDF document text
    • http://unseretochter.com/images/file/17446972376.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/tefomipomokizobijata.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-22-24-52-55.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/86763062338.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/26590899317.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/19374693388.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kiroxewegiwixijiwukozu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/ponekewoludekavutoke.pdfIn PDF document text
    • http://ellev.fr/upload/files/rebikomufaderif.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/81357881387.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/24333945817.pdfIn PDF document text
    • http://ahchala.com/img/file/xasovewurelezuxasodiwomo.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/14623907463.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/fawitogelokimajinad.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/92420099162.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908005955.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/81690746134.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/44602693667.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136176d4c8bd---16462141247.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/7159509566.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rolalozusew.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/99952461086.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/niwijopupumivefosim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+sites+to+download+free+android+gamesPDF 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_off0000b727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB727 15128 bytes
SHA-256: 5575b313af0635e51e58d02d1ce6b894ecf4e1f05edbae56657f29781a94b659
font_01_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 10836 bytes
SHA-256: 5363157351f336b0181f0fdb42df6b83d1ffd81092d8eb0a18c515b48d43e881
font_02_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1