Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a824e3dab55ba0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 09:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fd7bfab5eb2251ecdd46e50376f3dc6 SHA-1: e9ea48c77a4f282cd15ab24dd4be2c584a8d572b SHA-256: e9a824e3dab55ba0cea08a396f824109f352fd5403ea9a4654267bd5bb3b2fcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. While no scripts were extracted, the structure and numerous embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or credential harvesting tactics. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/zaran.pdf In PDF document text
    • http://vattuxaydunghl.com/userfiles/file/vanagigoluwebosugiruxol.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/9939475586.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bofumizarudipogore.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/30413412563.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xazidewobidux.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/50240595945.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/76183410310.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/81966828563.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f266c2ac---kezexivadikitujavomeken.pdfIn PDF document text
    • https://baptistfriends.org/media/zimozobitefepejosusojo.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/57227494270.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3a10svlr7qdfpi7jv8183bc746/12949720642.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/28474809055.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/36990227832.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/40132076134.pdfIn PDF document text
    • https://purefeeling8.com/data/file/dapevonade.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/68968909204.pdfIn PDF document text
    • http://ymmicro.com/files/files/67798231345.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/28940847998.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/84007443983.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/javojexo.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/letitupitu.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/paboxidif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cost+leadership+strategy+airline+industryPDF 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10916 bytes
SHA-256: fab3d6aaf948b8fc0f0b1402579ea43f3cfdd3c6961d61606a47dc284f5e2724
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16680 bytes
SHA-256: a7675c79bff549ca459602f91d7ff90cbc810a86e6c32b781c5eed4a74228d78
font_02_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1