Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d98989107f1978…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 09:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 86b5786c996f57d4bf48e4ec59aa03f0 SHA-1: 0a40c46707e623849375ba27b46ee024fe888af4 SHA-256: 53d98989107f1978569d9ab745a2ec58e11cf8a67de0629775273df78adf1679
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/wb?keyword=yamaha%20htr%204065%20airplay PDF link annotation
    • https://cdn.sqhk.co/tedogegez/e0jgfdi/74818212555.pdfIn PDF document text
    • http://ideaita.fun/fimixivekiwixutimumirzgov6.pdfIn PDF document text
    • http://itdiscount.pro/performance_evaluation_form_template_wordehcfj.pdfIn PDF document text
    • http://spiritstudio.ru/dunkaroos_2020_ingredientszq3gi.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/zuzuxesajonejov_fisox.pdfIn PDF document text
    • http://madamzero.com/xevesorulaj5n5l.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/download_catechism_of_the_catholic_church.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/fkjdagg/83234805540.pdfIn PDF document text
    • https://tebukebodo.weebly.com/uploads/1/3/1/3/131381901/poruxipelopidesibik.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/uhd1jc5/votopali.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/gd18tAI/fonctionnement_voiture_electrique_schema.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/mawotifag.pdfIn PDF document text
    • http://erogan-columbia.site/37118665196havun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotudokizer.onlinewebshop.net/37930867139.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_17467124628d4f2b9ea8dee0b46ca318.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_c489d14ebd7040c2953eedb8cdaaec1d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 2916 bytes
SHA-256: d6896a8d590524d713da62f4781ae9d0094211ee8a1d27191a0e6cffb6d58cb1
font_01_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5452 bytes
SHA-256: 0939a51fccc547dd3455a70418f69d340202e3252daa3734363fd6e5d3de7b5e
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 11704 bytes
SHA-256: b6511f754e63295f85b61a6d4067e78b3bd8fd714dc980c0137cbd7370762fdd

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