Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e8158c3f3874e…

MALICIOUS

PDF

62.8 KB Created: 2021-02-14 21:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: dbd04fc5699ce40179a8f38637ea7668 SHA-1: bc71263b9a2102b4cacd73abba4d37c24128209d SHA-256: cf7e8158c3f3874e3c2912d1db09d69dd9c854cf9a806187dd525478a93dc325
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/wix?keyword=daniel+reyes+obituary In PDF document text
    • https://xodebizig.weebly.com/uploads/1/3/2/6/132681497/1875710.pdfIn PDF document text
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/kugisizisebowadeve.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/gheKgcK/vozesugefasegeki.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/16d3f.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/jhhbMhd/synthesia_keyboard_game.pdfIn PDF document text
    • http://hytri.com/73229741029ti247.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/higgjiL/13809237057.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/zepifudoxapo/different_types_of_animals_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/ancient_greek_philosophy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/affidavit_of_support_form_korean_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/dirutikiju.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/blanch_condensed_light_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/7879670610.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/70348677309.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/mpsc_pre_2016_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/savovuwamizazexuzerubef.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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 4920 bytes
SHA-256: b72385857f2127320a3e4cdc83799405ab3f45657ff39ddc708866a806857b04
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 10728 bytes
SHA-256: 50858962eb53494c0cbf5d76d2399523ba3e7f2dd3ad97f234b3f99e0f9f699d

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