Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce781f41ccd6500…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 20:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8786f605e0900e6bc75fc9b8c2adb6e SHA-1: 6716d58c4c200998825a732143277bca6bdf8e1b SHA-256: 7ce781f41ccd650023eaa4088b6946330bc04badddd1848c9758ef51fa76c7e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

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 https://queure.ru/uplcv?utm_term=andy+android+emulator+free+download PDF link annotation
    • http://resheto.ru/users_images/fck/file/69801520591.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/1017401392.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/814900312.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/vofekososaze.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/xuretutogojedizut.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/xepafovodisijasopulatavur.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/93165341451.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/jejesi.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/jepiku.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/fagakelibegajenatukolevig.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/gizepelavaxopav.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161355f7b0d74f---33874141463.pdfIn PDF document text
    • http://iphysiology.ru/upload/66109318447.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/zamubumiwavusaxatopem.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xamak.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/wizamenidenigumeradog.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///89648322172.pdfIn PDF document text
    • http://rentaruedas.com/files/others/72293591754.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e61f3a1---64651310092.pdfIn PDF document text
    • http://sunsoftinfoway.net/ckfinder/userfiles/files/tofimefogetibixobog.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gupirijor.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fumuzezokowosuvur.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/kisagesawotosilojenezate.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sofikapowemilo.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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16776 bytes
SHA-256: 80d145769456f112069325dc19e87952d4e3766ed5c444fbd60bef55fb4ec348
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 10628 bytes
SHA-256: 0099000c6e082db1077a8ce21df6c89df72217db6d0de024e30e8544deb10797
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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