Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d23b4a88b324695…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 13:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f430675f7f47003260a425cf8a5ab469 SHA-1: d72c1eaaa6d48dfec9f73fad16de69b52a15693c SHA-256: 4d23b4a88b324695e97eea3c0cb490213f70ce7ed5c9bd975180b95816507c6a
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://xajibur.ru/123?utm_term=bollywood+movie+songs+free++2017 PDF link annotation
    • https://gedikorewugeg.weebly.com/uploads/1/3/0/7/130775309/8954589.pdfIn PDF document text
    • https://cdn.sqhk.co/boremagu/mbCjjgg/badminton_information_in_marathi_language.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/db71ecfd2a.pdfIn PDF document text
    • http://musc-media.xyz/download_lagu_playboy_exo_mp3badi8.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/6068fb8.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/idiajjM/tolajijodo.pdfIn PDF document text
    • http://carinsusa.com/bizulugut69d.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/c681c1a0.pdfIn PDF document text
    • http://shothard.site/amazon_kindle_paperwhite_manualtatkj.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/satame_litegakupip.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/aagjhja/71922784861.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/pamopejox.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/9482476.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/aiihajh/83761777458.pdfIn PDF document text
    • http://frasqen.online/long_acrylic_nails_coffin_shapet2pbl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/46f88b37-2c88-4a5f-b1a1-b7cd4f35be52/power_air_fryer_10_in_1_pro_elite_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd52811-20d1-48b9-af9b-ee94f91b0c95/salesforce_for_dummies_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/members_meeting_minutes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/simple_lab_report_template_latex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfe1415-e8ad-4c87-8475-1a2b33c1030a/lakshmi_ganapathi_stotram_in_telugu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 5432 bytes
SHA-256: 31b5bda9ef335678c3c1ff11b00f8fdeb10bdfb08a4d07cdce99611d1061d3f0
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 11252 bytes
SHA-256: 072069ed333db639b84a0435714466994f05e9c4a3a7aeaba9028aeae70ff7d2
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f