Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ef97b993ba1332…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f169c13ad0db874e477406792cf9c25e SHA-1: 81f1007606820a5dba93170a5947e0d913aac66a SHA-256: 71ef97b993ba133274cb8e0c058d4c501a0019f44c497c1ac274465b3479db48
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by multiple heuristics including ClamAV and an ML classifier. The link is disguised with a search query related to 'Les Miserables' to entice clicks. While no scripts were explicitly extracted, the PDF structure and the presence of malicious links strongly suggest it's designed to lead users to a phishing or malware distribution site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=les+miserables+film+songs+youtube In PDF document text
    • http://bimizuzi.sportsontheweb.net/atkins_paula_physical_chemistry.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/mastering_bitcoin_github.pdfIn PDF document text
    • http://bukanugizini.mygamesonline.org/52483942865.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/where_is_the_battery_on_a_dodge_avenger.pdfIn PDF document text
    • http://domifonupesif.iblogger.org/39601525406.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/capsule_size_chart_acg.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/fajixe/telatinurobipijit.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/rezepifub.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/16122503702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34f480b-c659-4910-90d5-cefbd0842f9a/harry_potter_lego_castle_71043_price.pdfIn PDF document text
    • http://malajusojak.epizy.com/academy_awards_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/delhi_ncr_weather_report_now.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/64666551684.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/38423790207.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/netflix_app_for_android_4._1._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e8ba08-fa22-4e3c-b779-cb36745fb680/71975780657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df3587-8d1b-47aa-8e33-032d962d4018/60193673416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453c63bd-91fb-4145-8fd8-8db42ae43bb9/wav_to_midi_ableton_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6ff2bb-296e-4693-bece-cd0dd40b7a3d/trigonometric_functions_geometry_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516f6ccb-fc10-469f-9f19-8b82116f8086/nonisuvi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5268 bytes
SHA-256: bf43e612b28eb217c64fecbf6b9c55ec5eaa8d33f10a4d51a6dd8a98e699d350
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 10860 bytes
SHA-256: f0e2b1a810789dea18dfcabf7076c60497d1755676cd50ae535d684aee8fe3df