Malicious PDF — malware analysis report

Static analysis result for SHA-256 851b9c1019d9b157…

MALICIOUS

PDF

77.0 KB Created: 2021-02-25 20:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 3a9245461740fc113744772a2349df61 SHA-1: d234cd4740261786db31f50c63f107fc45a800a2 SHA-256: 851b9c1019d9b157c2e621a740ec278d8440ac25f205b6e29db02581ed95c5ce
136 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
  • 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/wb?keyword=how%20to%20adjust%20poulan%20wild%20thing%20carb PDF link annotation
    • http://mufutekuson.getenjoyment.net/what_is_the_etiquette_for_mother_of_the_groom_dress.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/is_61_hours_the_last_reacher_novel.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/cgewWhb/sabewujixa.pdfIn PDF document text
    • http://potugonuxafeloz.iblogger.org/21830330325.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetoxofaw/YUf1CxV/italian_folk_songs_sheet_music.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/34284769055.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jfiahcE/88614882900.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/ihWtCii/zulamabideduw.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/zuses/42319773913.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/kaththi_tamil_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/6394913668.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/bivatakovujifolelilobexad.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/android_chrome_open_blank_page.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/notefifipufekuna.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/michigan_civil_service_test_study_guide.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 5604 bytes
SHA-256: 2216bc61fc3f68bf15b6cfa5025e045a8883619ba146bc23c7e3207fd6310739
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10680 bytes
SHA-256: dd65e56132b52ad57f2fd13ca7de1c8aaca426d57ed2aa9f3e13675d46d73849

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