Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a60c8e899efc9a3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 16:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b93bb17dffb820d5e1f59f49de9a98ba SHA-1: a851c2416f3793c1f225bd18accf8faaf386b021 SHA-256: 0a60c8e899efc9a3bc4457923388ce0451d8e61626ffb9ddf0243617a35816a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The file contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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://coretry.ru/uplcv?utm_term=text+notification+sounds+for+android PDF link annotation
    • http://petukmahaaaraj.com/userfiles/file/nesewitutaw.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/37777680258.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/vitewivozibajulugoj.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/wusukibupazosika.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fujosazipalafiwun.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96dd41257---95413252154.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/30970094897.pdfIn PDF document text
    • http://bwc.lt/i/90035649353.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/sudumazogeso.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/19216199305.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/sebigiluwuxarudagepokegu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4c00ab456de2bbc8e1400160c96e1d83/bosijorireza.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/2443133892.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/22195761664.pdfIn PDF document text
    • http://hodori247.com/uploads/files/relafoxemitozafisu.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/pemidoligukavuwejigo.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/xenipagilotinapajede.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jopujisipobopugawozibo.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/1901869903.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/15204767977.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910090022.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/vonufobejumoxadiparuxeje.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/81984636683.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-04/images/files/23539804814.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 18212 bytes
SHA-256: 6e9e22b959e99f183c299482379f51e06c2ed2399b41e4597e5e952d935c6872
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 10588 bytes
SHA-256: 17331c06c73ceb5f538ddbb324fd8815f9d862eb81f6360a58cba6a7d156c342