Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d561061aa3cbb9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 23:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5309d7f73839b3012e0334a98e3d825a SHA-1: b5ea8c3a6e334920fbd0c02137dca3311ee0ebcb SHA-256: 86d561061aa3cbb90097b2ddc3f318d81eb66125809edd29d94ed9c26452aceb
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'resalured.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link farms, often associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/aws?utm_term=what+are+the+2+types+of+steering+systems PDF link annotation
    • https://cdn.sqhk.co/tusupuwadoda/Uhdgdhb/74855415711.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/j9ij968/microsoft_analysis_services_free.pdfIn PDF document text
    • http://klosheff.xyz/fivijubomalizevaxouryoa.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/aHjfhhE/becoming_a_substitute_teacher_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/igrpRii/96451767194.pdfIn PDF document text
    • http://sesalon.xyz/2332043774ix38c.pdfIn PDF document text
    • http://optalpha.com/tidaxanilusuxapowujjjr7x.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotefi/obgjhjV/installer_shader_minecraft_pe.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/bulletin_de_salaire_vierge_2020.pdfIn PDF document text
    • http://falenubodopo.22web.org/pozubunagudezigevotowofom.pdfIn PDF document text
    • http://rezotu.xyz/choc_dapple_dachshund_for_sale809mf.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/idXjcqI/mufavo.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/dosalapasenow/android_studio_3_enable_adb_integration.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/mettler_toledo_safeline_metal_detector_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/jawewufaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/rijabomugojuzetekibo.pdfIn PDF document text
    • http://musomowelego.epizy.com/angular_ng_template_let.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 5532 bytes
SHA-256: 888ca4d0fe387f9ae7e67a851098cdf275a71a4cd629d55e3a7501936fb67e48
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10460 bytes
SHA-256: af02913912681dac580f478956fbab8d6d3bb067141cb4579e406e8f3f3eaf7a

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