Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dadb640bf943f9a…

MALICIOUS

PDF

76.6 KB Created: 2021-02-19 15:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b70703e8c860696b57983fac8536fc5b SHA-1: d40897957abced0f00e74f0e71a478dca370c2d3 SHA-256: 6dadb640bf943f9a68fe264745404cfb9a991659587b4a2747ea4af8cd62bdec
136 Risk Score

Malware Insights

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

The PDF contains a lure related to 'screen recorder apk no root android' and a high-risk heuristic firing for a SEO redirector link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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
  • 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://jacksth.ru/wix?keyword=screen+recorder+apk+no+root+android PDF link annotation
    • https://cdn.sqhk.co/tuwetebep/jd3Vaia/ludotonikobirek.pdfIn PDF document text
    • http://cheapestshop.xyz/how_to_send_a_video_in_messenger_using_laptopuitif.pdfIn PDF document text
    • http://alisabor.design/brooklinen_sheets_washingbqyv3.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/wupixufekijax/kuxibagigefonuli.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/bamboo_lyocell_sheets_review.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/43329221979.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/mazda_android_auto_retrofit_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/aaron_donald_college_scouting_report.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/vusorovenasesef.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/chale_aana_song_audio_free.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/let_s_go_pikachu_shiny_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/pelobemefoxabufeje.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/42341710214.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/36405294756.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/indisposed_crossword_answer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 5024 bytes
SHA-256: 11a329a810be07dd05d701c1c8f14477a8c7b3c09d303f059323c7f1efdf8b62
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 10112 bytes
SHA-256: 99537402e684d981385a059f992dce8c3a0be71afd5f113582bb7f3122ea3571
font_02_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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