Malicious PDF — malware analysis report

Static analysis result for SHA-256 2615e820d131cf23…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 19:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4976de7cb10be4f7d01515bc136323f9 SHA-1: d7d7bfb4b118d09d35d4950b682f443eb9bfac1a SHA-256: 2615e820d131cf23ddccf7d07f9c9c7d5cf3dd45ade1eeb49fea8ee4ffb1b2e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

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://www.ftha.org/admin/ckfinder/userfiles/files/sanukaregoporubixaroxozog.pdf In PDF document text
    • http://cascinamana.it/userfiles/file/wiperan.pdfIn PDF document text
    • https://equinox-e.com/upload/files/6828893904.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/22619172872.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/murisudone.pdfIn PDF document text
    • http://only-svet.ru/upload/files/59784303343.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9c7763477009a191a3d9b4f6034558b/67474518683.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/46410064985.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/59200736145.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/9034298586.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/vabedefuwofuxixobuluj.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/93136342054.pdfIn PDF document text
    • https://uangraja.com/contents/files/25039373238.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/fefaselekojudejikisur.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/95074643762.pdfIn PDF document text
    • http://hanifeugur.com/image/files/lewoparowirolakur.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/72122267160.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210904181424842509.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/lopabimusevaxobazelak.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapesibabosuxarewevalub.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/pisuroje.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/zosesemenuwaxuxatexezuv.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/35238930908.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/boditezuf.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vedosemotuwudujobeberi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stick+war+mod+2020PDF 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_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 10576 bytes
SHA-256: ae736541828d14f71e981dcc089fae0bd54ea1511f3f8dddd011cf2870b179f6
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 18424 bytes
SHA-256: d24ae5aadc0b1da82c3b5baca0b0cfa14e3daaf121bc6eef1059a8f00864ec74