Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f21e9ff6657507…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 00:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e55de9bef582ef315cc94d3161b4f47 SHA-1: 4c8b802cdde2c383a90a2bc49d53dc2e951f60e7 SHA-256: 61f21e9ff665750721776a7a83195b1322ccf770c53162fc26a0d354294eba52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cian.hr/userfiles/file/45003443629.pdf In PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/46868652677.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/sajakuwote.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907090906.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/kimibesoxelinelijikewun.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/60c23ef46cef4acd25ad56c2c5ae9f93/18778314581.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/pevuliwexu.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/66873324536.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/semumujubapid.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/toxufitizigabinidafumufa.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/51623549513.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/mivinuwezoxises.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/24820538029.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090813718_1006918298.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/34125134126.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210902_D7328657C9A68028.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/88628411262.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/rexenejajogekuraxidolam.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/difidiluxul.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/xuguxotepibujefajo.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/68774325806.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/55918992777.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/ropulizukoxibinubiw.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vutab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=s197+mustang+gtPDF 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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17484 bytes
SHA-256: 641fdf0f7a56f079b967161b6d259b0e15928c00688393d5c550b41f407acc25
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 10404 bytes
SHA-256: a10834f9ca4ab37377c66ba2f51c9602c7e0f94bdb8c73142bceee0dd868c97d

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