Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc493d32f127c2bb…

MALICIOUS

PDF

91.5 KB Created: 2021-10-07 12:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae10e330c9d8569032be5642f232d43c SHA-1: 2ebbc93bcf059c09b9917f5662e6c9d3503f48f4 SHA-256: bc493d32f127c2bbac533b704ac54957712c26f42b4806460f25ad5ae2886cd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URI indicators and the ML classification strongly support its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=i+had+a+dream+i+got+everything+i+wanted PDF link annotation
    • http://fcraregistration.com/UploadedData/file/wediberude.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/dozepoxininemeruk.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/82550859033.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zolixepoba.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/54578020146.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/dibexogivufawiwemet.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/28201199812.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/28805252513.pdfIn PDF document text
    • http://rhondachem.com/d/files/rufilug.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/tanit.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/texazasalam.pdfIn PDF document text
    • http://ponozky.gultio.cz/webpagebuilder/ckfinder/userfiles/files/ganuvevuwol.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7312e652f---panimupujigisufade.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/23294511865.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/zaluxegewomajexepodazut.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/78462984536.pdfIn PDF document text
    • http://saaretravel.ee/images/file/neziwuverazalinosuze.pdfIn PDF document text
    • http://fluorescent-training.com/file/97300272708.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/worokarudonosatow.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/wabuvuxabudariloboxixadeg.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/50818074482.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/wodukin.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/ragetuzebifobiji.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/totoxew.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/7446992988.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_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 19060 bytes
SHA-256: e72073bb4d31620ac33f9a293adccaf66c45d1cdb6b2a58c53d57002f3613dcd
font_01_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 10696 bytes
SHA-256: e9c3be61af6015cbcd31475d767642d2809330d2f71ac3a9630e5aa81d97de9e
font_02_sfnt_off000147fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1