Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbdd5537601a92e…

MALICIOUS

PDF

78.6 KB Created: 2021-04-16 04:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2963724a579c1b6a7106bdcfee82377d SHA-1: b375e54f1c78933361b2903d323d11823cb8bbe2 SHA-256: ecbdd5537601a92ea17d3e49e10db94e67ea7c71f0d3b7173b3a55d7c3ded68f
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically using a 'Browser extension / update installation lure' to trick users into clicking malicious links. The document contains numerous external links, many of which point to redirectors or potentially malicious domains, including 'jumiwimov.ru'. The presence of a large number of external links and the ML classifier's high confidence score indicate a malicious intent to direct users to harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/strik?utm_term=what+is+the+monthly+income+of+ethical+hacker PDF link annotation
    • https://cdn.sqhk.co/nevawanipo/USshfQe/fafugubaxeg.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/pibipatefutus.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/062cc.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/pijowevinu.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/narotekaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/giiehfX/kuduxemasefoduraxuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/rid1832/tubal_ligation_procedure.pdfIn PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/nasode-zurogimi-zezapirako.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/wokodejov-wosujaxedi.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/differential_calculus_by_gorakh_prasad_download.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/zuluji.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/57736690410.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/numunenoji/how_to_read_a_novel.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/19864776669.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/nevumidaz.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/features_of_the_act_of_uniformity.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/33222261898.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/lukirulagifowowuwopejokoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/printable_weekly_calendar_template.pdfIn PDF document text
    • http://torumaxot.rf.gd/latiz.pdfIn PDF document text
    • http://dutugege.epizy.com/zojoxakulikomanefirese.pdfIn PDF document text
    • http://sovewegupafipiw.rf.gd/82748334769.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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5300 bytes
SHA-256: a3552ddd56ed71822cb230f69663a6fcec07ab4e4cd1d18265456151b0a9eb9a
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 11472 bytes
SHA-256: 7b107bddb86f8e55f93e5ed367db0d331e00a10b23dd90350c457d4c446b9dc2

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