Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83bf3a96b90e06…

MALICIOUS

PDF

90.0 KB Created: 2021-09-20 21:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03691d9939952565a3c555508736499d SHA-1: 398db4ea8f01f3ad8530d55f6188fde05ae68201 SHA-256: ec83bf3a96b90e066987ae3b5c9e1e782b8edc1a8fa8d4ee02979c5ea9585fb4
126 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. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of phishing or malware distribution campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://eprobatdz.com/ckfinder/userfiles/files/19714150138.pdf In PDF document text
    • https://adikkeempat.com/contents/files/takafefasawisodenigi.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/55945923354.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/fujifebakerapam.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/bixeburuzakutovolabiraxi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/rekeduximizize.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/radaketutelizonuxu.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/53330119990.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gotajerazipukusul.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/kavafizemebibinajimuwus.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/35304499502.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pedokosibezasozibu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/67327232125.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146275e71cba---46113697309.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/solimorar.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/pexetunavoselujimuxapabu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0844a323a---niwolipazanumibezivavoz.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/xexilujo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/rajagexomeju.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/lexonupemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+play+games+on+mi+tv+stickPDF 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_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 18044 bytes
SHA-256: bb2b48f1d3aba6fb3907a82da9201f417a19cbca1b50f132e53e8daa1795b9df
font_02_sfnt_off000140f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F2 10964 bytes
SHA-256: b7d21b414d8baaebc5524ebde2f219c9f888fc90827452a3c3f41add1e078c13

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