Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b27d236d7e0e159…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 23:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea4255418c40cf7f14a3352259cb1399 SHA-1: 88530ecd1b0f48103f338848ea55a5c8e2707476 SHA-256: 6b27d236d7e0e159088a9cdc577d60f8e73ec0688e2b7aa38c786196813a060f
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URIs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, with a high ML score further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://terracell.pt/images/file/xulunoxiv.pdf In PDF document text
    • http://retrolondontees.com/userfiles/file/wotikidatexuwoxevulatax.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/11297499726.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109010429158396.pdfIn PDF document text
    • https://2winit.com/Files/files/mimagapazatoba.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/xenew.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e633b11d60---35912976951.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/pixexuziviwofesanam.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/48827856943.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/59621320221.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135267119035---kuxetexefivegison.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/43498797368.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/tomiviwoguxonajep.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zaxixizanumekaxesamudebo.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xipig.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/36151686792.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/wupapegiko.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/81847804145.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/41477891721.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/44707087808.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/34368994110.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/17241470742.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/36113163760.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gabajagovugadanubi.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/33752882697.pdfPDF link annotation
    • http://nepodoshlo.kz/ckfinder/userfiles/files/zasoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+room+2+apk+downloadPDF 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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 10560 bytes
SHA-256: aac95c8e6136fc71d15268b66c74a89d4755bbab55080e39b50c2403600d8b42
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 18584 bytes
SHA-256: 43d8ed5a52c4f1e5257cae801399e907265421af64b84ea0342a42dc2dd96cc6