Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ffa6712767335…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 08:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5da1881b706ec4d8371efe1619808ee5 SHA-1: 2b303f10c1afd76071e28fb01a1eaf94783deb66 SHA-256: 869ffa6712767335172f07b29f5cfa99f963daba6b9564d09b77049d402cc553
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=last+day+on+earth+hack+2021+ios PDF link annotation
    • https://tahitotfalu.hu/ckfinder/userfiles/files/84863023200.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/89236406827.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/49377722664.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/75087289671.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/97478577595.pdfIn PDF document text
    • https://recrut.com/files/files/wimigolaxamelopifofebal.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/36577422258.pdfIn PDF document text
    • https://davaocarrental.com/images/file/51924400635.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/silowisifofejamabon.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210901065606.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/zuxulijeluni.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/23650188097.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/65cb1fa0063601ab93343f25e099baea/pibewojew.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/luvulu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc93c70b4---pumuzobup.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/95875520678.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/27544245902.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/29104153088.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/50141811949.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/90522274858.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/97521088028.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///52117117845.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/lusogezutajekod.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/90405352937.pdfIn PDF document text
    • http://floramarble.com/uploads/94091945172.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 10876 bytes
SHA-256: f1e16d8dfbf9e66c2555646c2a3ee07aa7d86515f0a9294c73d86754710b12fb
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 17680 bytes
SHA-256: 354714a64a19696706e35ab3accddf8aefb7dcfbfc9eba64dc8177a858ec242b
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1