Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef34b31e6218982…

MALICIOUS

PDF

74.7 KB Created: 2021-04-22 00:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e72f6f95b0c8baaa9de51076cd13a4d4 SHA-1: c8cf9ee986aee96ad7824f7ff25e1af75e7a6944 SHA-256: 7ef34b31e6218982facf43d8139f1ac19bf2f5dc60484b1c12157c9d8264c243
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains an image lure that redirects to an SEO redirector URL, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall pattern points to a phishing lure designed to lead the user to a malicious 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
  • 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://midufefew.ru/strik?utm_term=the+lathe+of+heaven+book+club+questions PDF link annotation
    • http://vutunema.mypressonline.com/99242773939.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/UiggfXI/nevutudem.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/ilgg4gj/bahubali_2_movies_counter.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/walerijuvijemuropemawu.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/gggHYya/15000398293.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/dgdxghX/34350597361.pdfIn PDF document text
    • http://goxivomibivufuv.mywebcommunity.org/72820837178.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/bamepofewalada/zovuw.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/lusat.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/cbr_test_free_download.pdfIn PDF document text
    • http://nosawakudik.myartsonline.com/53305099279.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/kisah_ulama_menuntut_ilmu.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/centring_sheet_manufacturers_in_hyderabad.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/how_to_download_k-lite_codec_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/fubavibupesokus.pdfIn PDF document text
    • http://roveramo.atwebpages.com/damajarivifibez.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/student_database_management_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/the_triple_threat_academy_of_performing_arts.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/game_of_thrones_book_synopsis.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 5212 bytes
SHA-256: b45c35a4595dfbc2eccb8d6b45ae89772c723d6ebce118068283421e539113c8
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10664 bytes
SHA-256: 48e8f1aae915c423db8aeed3306667fe965a4da4e653418dc2100bb1205b1757

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