Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ac478ca0f87ba3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 16:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed7cf1b3a7c97b296d44ff58ea8e523f SHA-1: 689277228b9bfeb666107dafbe7342002e6a6b74 SHA-256: 71ac478ca0f87ba384c70d7e550b89ec559926549a1c6fdedafb4c9bb52b2630
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://abnigakgdsg.friendship-match.com/upload/files/wotino.pdf In PDF document text
    • http://ayhancevik.com/images_upload/files/258992486.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/96771696452.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/25875703456.pdfIn PDF document text
    • http://rococosofa.com/files/files/99199716319.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/88310975351.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/5468498988.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/romigeguvuxabodobazabawev.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fokil.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/nuzoz.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/nanoxasupetiwexakarawagi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161350d62b713f---58907071982.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/30032047850.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/89130307975.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468d5fa2832---87420322101.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/dirurofusoxozojajuwujaf.pdfIn PDF document text
    • http://101balkon.ru/upload/files/bozivixotikudosor.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd6f1edfe---6761446254.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/52835804602.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sajozol.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/73400436166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=battery+percent+app+androidPDF 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_off0000c2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 10460 bytes
SHA-256: ff808b72398b41681807b033d500410d524da07c691ae0623c09846ce8134f3f
font_02_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 16480 bytes
SHA-256: c85d520e795359b99e4f052b28077ade1b6e5cc69fc8f26c55eab8efd37497ee