Malicious PDF — malware analysis report

Static analysis result for SHA-256 93dc4f756adca5bf…

MALICIOUS

PDF

74.9 KB Created: 2021-04-02 18:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e1b93e5c5fb050e4c170560f53761eb SHA-1: 21ede854686a8568dac043105bab8a12c73f4f12 SHA-256: 93dc4f756adca5bff63b267e213affcc2db81a97df3be6ccfce71f9f46256e4b
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'relation function domain and range calculator' and utilizes an SEO redirector to a suspicious URL. Heuristics indicate this is a phishing attempt, and ClamAV detection confirms it as a malicious PDF. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=relation+function+domain+and+range+calculator PDF link annotation
    • http://tulutita.sportsontheweb.net/learning_and_development_job_description.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/june_2020_current_affairs_bankersadda.pdfIn PDF document text
    • http://gutprod.xyz/access_database_query_formchmce.pdfIn PDF document text
    • http://naturaitalia.space/jegemubufinejinebuxowugajdspk2.pdfIn PDF document text
    • http://naturebiolog.space/besikijogojupew3q2xn.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/goravo.pdfIn PDF document text
    • http://uscreditreport.info/fapawuzedep7lbt.pdfIn PDF document text
    • http://maska-respirator.shop/home_zone_security_led_light_costco_canadakxjod.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/lp_urolithiasis.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/algebra_2_worksheets.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/gapivegek/fukutunuxin.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/leximejizodi.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/jotuzokovekowenemumupovo.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/how_to_replace_battery_in_kidde_hardwire_smoke_detector.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/tapejure.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/dowesimerunolunotopu.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/98818582101.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/deep_freeze_windows_10_serial_key.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/ge_cafe_dual_fuel_range_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/giperijasivifepuvas.pdfIn PDF document text
    • http://jelomasulavi.atwebpages.com/vibiwitobexukewir.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/ohio_bobcats_football_media_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/thermo_king_trailer_near_me.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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 5172 bytes
SHA-256: f7e54ff9882e70369920961f2b09a860248ff345e15ba699adcbd5f105b76e7b
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 9812 bytes
SHA-256: a81ef569067c3b3fb5c22b09a0461c7cecdded945efb2635f2f8a808db7a7036

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