Malicious PDF — malware analysis report

Static analysis result for SHA-256 8489cba982a046ea…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 14:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1509e3bc651698511e0f7538c472bada SHA-1: d09e55a450a1d06068521306d73d356b2641ad6e SHA-256: 8489cba982a046eab916bd5134e217b63583bdf92f4940b5c65683db26da3830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, further supporting this assessment. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://irlanc.ru/uplcv?utm_term=how+to+get+facetime+audio
    • https://mdteam.se/ckfinder/userfiles/files/sadagobozojifuzabebo.pdf
    • http://mya1fc.com/files/ckuploads/files/luxovozaxulakosopuzazited.pdf
    • https://www.karelo.com/uploads/File/80462412611.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/bekejajivudej.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/75246340079.pdf
    • http://elpijisystem.com/file/76054275113.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/52726186477.pdf
    • http://szentistvanpatika.hu/upload/file/besatedexikitagomu.pdf
    • https://ibrahimkoc.com/images/Media/files/48140177506.pdf
    • http://www.europesolidaire.eu/userfiles/files/77315905140.pdf
    • http://dj-venci.com/uploads/pages/files/wefoburulafekusisusawujaw.pdf
    • https://tmtteks.com/files/68294523919.pdf
    • http://hiredriver.com/uploads/assets/files/sekovagixudamudexamorati.pdf
    • http://deshdunya.com/blogimage/file/xogir.pdf
    • http://envisystem.com/upload/userfile/files/titebanavaxabiluzelusok.pdf
    • http://le-nora.com/userfiles/file/mefugak.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161485b0ce4eed---womisunekupezodibobut.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/gatefigusojizos.pdf
    • http://abaj.cz/UserFiles/File/zogonegub.pdf
    • http://fra2ange.it/userfiles/files/82319659391.pdf
    • http://hcstonetw.com/uploads/files/202109050222002182.pdf
    • https://sunarchegypt.com/userfiles/file/kudez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee5.bin
c88d79901729470e04ca37ccdf37806c6648329dfc63cdfb70104e177ee7fb3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 10576 bytes
font_01_sfnt_off0000c6e9.bin
b9a825e56da870975f6be9fe94dabd76dcd66cca49b041716352077b59974222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 14504 bytes
font_02_sfnt_off0000eb65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes

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