Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ee509a0ca04bef…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 10:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c795a6dc0a6276ac9f486e53f07a1432 SHA-1: 23be9f84a7544e6047e68ab2452084dc744c5ed9 SHA-256: 49ee509a0ca04bef30dc7b702936d8bafc1c0917b265bea4b6afe92015491dc3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, likely to trick users into downloading further malware. The presence of embedded URLs and the 'download button' heuristic further support this phishing and download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tehla.eu/userfiles/file/69084330779.pdf In PDF document text
    • http://sinoorchids.com/image/file/nuzenobanol.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/jiwuwuropafuxarudomimalab.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137521fe1a44---61274733900.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/rikalipufa.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/7052291151.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/kusazexamivifizi.pdfIn PDF document text
    • http://lejuriste.ru/files/file/49228135855.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/rukewikigixepop.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/14244838251.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xiwopujuzubi.pdfIn PDF document text
    • https://dukupahit.com/contents/files/nifogamop.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f3ab1de7---11272285736.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kujulawogazuwesobe.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/vojefiwade.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/mowedebinusofurusuf.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/makegu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/93238672173.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/todunavotudererapolubo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kelugup.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/84928162700.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210915142913.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zesovasotirazazimulidakop.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109050622561268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manga+apps+apkPDF 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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 18556 bytes
SHA-256: 51df0d3869b00a1cefe1fbd7982d4d3d26d2a4df9052243115d8090fab9a56f3
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 9924 bytes
SHA-256: 1f83906ab5e9c0f6555b87e3708f9dde848e2df47e25805f25693fcd84b60fc5
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1