Malicious PDF — malware analysis report

Static analysis result for SHA-256 a360bc7b6c2ecfec…

MALICIOUS

PDF

75.4 KB Created: 2021-02-05 04:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0d73fd6820661af938652f7effcc9f3e SHA-1: 160b2059d5ee8cb5b1685402c315555cb9554fde SHA-256: a360bc7b6c2ecfec638e6cfcdc477f2dfd3c8eb57e0f2a09b5e59d3fcab77f9c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The document body is heavily corrupted, but the presence of external URIs and the overall heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://maypoin.ru/123?utm_term=sierra+blanca+peak+gondola+rides PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416923/normal_5feb273f8916a.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/Yigjdjh/love_quotes_stickers_for_whatsapp_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5fde2155e8510.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/dVhaDja/fanemefurimaxisosus.pdfIn PDF document text
    • http://remontvorot24.com/to_do_list_app_for_windows_and_iphonec8foh.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/xagone12jhg.pdfIn PDF document text
    • http://picsonair.com/bubble_drinks_pricewoeqv.pdfIn PDF document text
    • http://onlinekartiadesi.com/44hyb5f.pdfIn PDF document text
    • http://loveantravel.xyz/bombshell_perfume_3._4_ozg6av7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fdedaf085cff.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/ihggjji/restaurant_dash_gordon_ramsay_auto_chefs.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/wieijjc/duparuwuzimepibera.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/jihg12T/mirrorless_camera_black_friday_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/jAOLeic/kikezegoxudepojujenigoso.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/9rrC8jd/forest_kingdom_blacksmith_nier.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/fjiuiig/university_of_alberta_indigenous_canada_dan_levy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/business_case_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/20827220735.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/wuzezomumumiwujo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5548 bytes
SHA-256: ca971868ef15fe2fe784eec8638a936ab081444d71327bb21a5d1267845fe7c2
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 10632 bytes
SHA-256: a4b496b33ceaf7800150ac6309d53e26252171d2a52881414ee030a3e30be0a1

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