Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df2051cd71bba0…

MALICIOUS

PDF

70.8 KB Created: 2021-02-23 01:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: a9ba6cccb0b9fc23ca85e7ee6b3b35cb SHA-1: 9a8e318eed3f284eb95ffe8082b6572dda381eaa SHA-256: a8df2051cd71bba0525713c1b6d597d15c5fd7b1fc1537ad138758f21d91fd17
194 Risk Score

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://crophysi.ru/aws?utm_term=redhead+food+dehydrator+instructions In PDF document text
    • http://topdouche.xyz/inventory_spreadsheet_template_printable9ls5g.pdfIn PDF document text
    • http://fasad-dom.site/cuantos_pies_cuadrados_tiene_un_metro_cuadrado_yahool9979.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/e7ywWHQ/zombie_mob_sniper_3d_free_download.pdfIn PDF document text
    • http://nojosomefoviw.66ghz.com/houghton_mifflin_harcourt_math_book_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/A7knjey/black_friday_2020_iphone_deals_best_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/gcgjN9q/85180477204.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/belopudevuzuza/zikiwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/pekinamebositirigiraf.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/dexotopofagavol.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/bring_it_on_ghost_korean_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/new_canada_food_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/what_foods_to_eat_on_a_parasite_cleanse.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/5th_grade_spelling_bee_words_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/68356371120.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/manual_handling_risk_assessment_example.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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 5188 bytes
SHA-256: a2eac7bb95135e0a6cd797be5c6ff3616285e2a83b4088b5ad274d6b0b286240
font_01_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 10992 bytes
SHA-256: ef86506883bdd64700fbc1eac43ee2f501d5834feb5e2b5517345e34c5415bd9