Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1caea25ae25e1db…

MALICIOUS

PDF

74.8 KB Created: 2021-04-17 12:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1bcf76e183e73f68e72521b1c86b7219 SHA-1: c0f491f83b31fc660dbde191baf3b85c17ba50d9 SHA-256: e1caea25ae25e1db8359d695192f667f6b83958c79a9a923ffc8ac7772cddef0
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Lista de verbos regulares terminados en ar er ir' and uses an embedded URL that redirects to a phishing domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing purposes. No scripts were extracted, but the PDF structure and embedded URI point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=lista+de+verbos+regulares+terminados+en+ar+er+ir PDF link annotation
    • https://cdn.sqhk.co/juwovatagevi/fiicjav/9138251347.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/djhVheQ/80392491252.pdfIn PDF document text
    • http://damvglaz0.xyz/game_of_thrones_books_fire_and_bloodprqwk.pdfIn PDF document text
    • http://itayoga.space/52025322501nsa7.pdfIn PDF document text
    • http://hopecommunitynaz.com/67689794608nb3rq.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/eijzNN4/white_noise_generator_office.pdfIn PDF document text
    • http://tedamowajowiw.22web.org/mogawitoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/2algghd/bouncy_castle_fips_c.pdfIn PDF document text
    • http://zagavogafewakud.iblogger.org/68898415240.pdfIn PDF document text
    • http://samelike.site/sas_macro_import_multiple_excel_sheets3xu8q.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/Pighgii/netol.pdfIn PDF document text
    • http://roskycnmx.com/what_are_the_possible_questions_in_an_interview_for_teachersnt9zr.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/luworizesupox/themes_in_anthem_for_doomed_youth.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/premam_malayalam_movies_2015_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/surge_arrester_schneider.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/wu_tang_the_saga_continues_hulu_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/diabetes_ramadan_guidelines_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/1101042060.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/69329975436.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/30295155664.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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 5284 bytes
SHA-256: 032b6668270e583518fa164967ea74cc00cbad2717bd620b10a6049f020a4210
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 13212 bytes
SHA-256: 51a57b20fe5c9ae1a05062294d9f185b071b0921ac16a436c20e7bb81ea467ab

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