Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0e25c7ef7b613c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 20:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e9ca459c565f5b052c0d43267e878cef SHA-1: 2408f9e378d957b13307d4fb6ce792f952d95ec8 SHA-256: 1b0e25c7ef7b613cc80635c2a424f2d5d126c84307edffbcaafe6290a50ff047
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that act as a link farm, redirecting to various PDF files hosted on different domains. This behavior is characteristic of phishing or malware distribution campaigns, where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/o80il9mcn4b2bvftirda3l4ho9/mejekatik.pdf In PDF document text
    • http://a-b-i-s.net/layout/bilder/file/generodirizetuki.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/padiduvazusumanagitakig.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/talolugotaxugijutotanawi.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/70569139216.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/83054808233.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/84788379928.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gk04o28pakg75orpg43bu899u8/65510888855.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/nawubegiluwarifo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/bixeratufigelema.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210903_6839ED51C2F52EF7.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/67471217996.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/76137611001.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/8346490019.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nizixexukelulupinefidi.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofuderul.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/23200841287.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/zowumamarukamuxurikiv.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/futugatodewo.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/gogotegulix.pdfIn PDF document text
    • http://nature-revive.org/files/file/natejirusanemani.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/82929136856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+tennis+live+streaming+2021PDF 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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 15172 bytes
SHA-256: cfbcc010daca805de3ace97467b5a7768f2e2de1483044e4e3c1d9bff3ca7e25
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10668 bytes
SHA-256: 041ed1ea7bfef32c6c9acf8121184646b261a8fc54051027117d4b2e85c13d9d