Malicious PDF — malware analysis report

Static analysis result for SHA-256 5483be1cff4412f7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 08:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f7dff3b7e6f4c4363598ff7c0838476 SHA-1: 866dcd8efb0e07204a2b21db8768bf1ed2b305b9 SHA-256: 5483be1cff4412f7f2918bfe142a99ef32bd9a8f33b0a89d298adfc236a39e14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed a significant number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of numerous unknown URLs further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://e-sportis.com/images/upload/guposamal.pdf In PDF document text
    • http://mcserpenti.com/userfiles/file/kekuwolezifedigojal.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/58368154162.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/sopajuvakipatapulusig.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/59109281685.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/goxerafipajivuwobalif.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/doniro.pdfIn PDF document text
    • http://cascad-trans.ru/files/legiseb.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad42ddb84---mujojosoki.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/30658745332.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/27264569170.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/nivajokofijobifubod.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/76112087529.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/rorevufi.pdfIn PDF document text
    • http://zubrcup.by/files/files/dugugezopo.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905070223234508.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/kalowinatajajejizo.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/pelexakavuviwobeluzela.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/62354094794.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/zalazuf.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/xuzigarijejomijononoxu.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/labasuwifobato.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xezetumanapaponulodimewe.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210905_194842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=recipe+keeper+app+androidPDF 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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 17396 bytes
SHA-256: 67af3a75ba6929f13e3c78bd684dd43eb95a49f725d7579bd465d13a9341be27
font_01_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 10332 bytes
SHA-256: eee3b7ffb27af3a4bab9af77603ab27b7e848851ede96b0c1df545761c97bb35