Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cca37b9f5f5454f…

MALICIOUS

PDF

73.9 KB Created: 2021-01-20 19:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4c0c1044ce4b7f24e9309607fa569616 SHA-1: a3e12430722f8fa663eefdd49b84bc47018f2ef4 SHA-256: 6cca37b9f5f5454ffbdab18cfdec623b62237d88a30154314c842babdeb26f5a
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crophysi.ru/123?utm_term=national+audubon+society+field+guide+to+mushrooms+pdf In PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/05685fa8b2.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/ceXIFvA/48263259130.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/konupa.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/gfoghON/98308276050.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/financial_accounting_reports.pdfIn PDF document text
    • https://site-1175610.mozfiles.com/files/1175610/on_my_own_song_ashes_remain.pdfIn PDF document text
    • https://site-1258053.mozfiles.com/files/1258053/kannada_chalanachitra_geethegalu.pdfIn PDF document text
    • https://cdn.sqhk.co/nufanusiki/ZjfjiWk/gel_color_like_ballet_slippers.pdfIn PDF document text
    • https://site-1178703.mozfiles.com/files/1178703/cartoon_video_maker_apk.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/jotizifime/39459340239.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/kitibo.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/bipibigemopasejojeruva.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/fact_and_opinion_worksheets_with_answers.pdfIn PDF document text
    • http://bususetut.epizy.com/how_is_your_day_going_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/shouting_bird_meme_template.pdfIn PDF document text
    • http://joluror.rf.gd/problem_solving_worksheet_ks2.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/78422877541.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/lefekupurelimazekafo.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5780 bytes
SHA-256: f1657aa58d00e1bb186ede23b899b12fc1b7f76eca0ae0284ff5d9abd4bcece2
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 10436 bytes
SHA-256: 30fb269bf8e2f0b4eb77cd043c708a8b498349b9cf9217decb9434ef6bab602d

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