Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27ee16b82e311e1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 16:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddc7f5a831b13fe9910117ae5671cade SHA-1: 0f70a24511a5ec6d7daa544a5971f8232915840c SHA-256: d27ee16b82e311e11347a9d7ec800682204976f3c288ff30ee7bc87417874cb3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=zed+shaw+learn+python+the+hard+way+pdf PDF link annotation
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901102508369629.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/sonebumutomesemad.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/696a873cf607dd6e74a95f23f17c31ad/wazolipirilaxetumuxasekad.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gisinazizefuruganus.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/5758163808.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/83345073558.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/73725680708.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf106dd23---lemotasulugivodinivelox.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/mogawavotivovetewama.pdfIn PDF document text
    • http://topstec.com/d/files/riletiminirudofikezaxuzul.pdfIn PDF document text
    • http://www.moyekolodin.com/files/figipipazimofugovosutu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zurogiremobibadew.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/14/marolidebawidenowixux.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/jesurexowekimivep.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/givagixum.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/kenoxiwowapagivowukase.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/37798328121.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/sunofitiwofafomilekefe.pdfIn PDF document text
    • http://e-hematologica.com/users/file/gatipekuwo.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/venepapapuwuzopewanijira.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wesawidovu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87158406189.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/jiduzikimoluruwidunajoz.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/49917763168.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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 18124 bytes
SHA-256: 2759325d3549f76d4ba201016e24e814d7da4e6940de06659b14638beee73ce1
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 10664 bytes
SHA-256: e3cd20cfcf441d046891598d79310876c5f0d32a79b230c3d3d01e04f86c5df3