Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5c0e2f5cc91be5…

MALICIOUS

PDF

66.7 KB Created: 2021-02-09 10:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f03337b7778c9afb23e7533843723b4b SHA-1: cfe99808409b3bda46580e34bf163aca95f32a0f SHA-256: 8a5c0e2f5cc91be5053209e5108a0afb9a72039debd70a090e3295c349c3bf9a
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/123?utm_term=introduction+to+logic+book+answers In PDF document text
    • https://cdn.sqhk.co/menigopas/kjjjchj/leopard_kingpin_ball_python.pdfIn PDF document text
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/xowiwejabi_dasas_linugavo_vulisaju.pdfIn PDF document text
    • https://tizojutatow.weebly.com/uploads/1/3/1/4/131406606/3a6e11f58e1.pdfIn PDF document text
    • https://baduzizexajozej.weebly.com/uploads/1/3/4/6/134653824/c1480e332.pdfIn PDF document text
    • http://tufepuwaw.iblogger.org/prison_break_quora.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/7hcpYt3/gonovaji.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/5072813.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/dHcjgZL/line_art_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/iiZQajd/67626990704.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/wexukufedepim/39023037161.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/goods_received_not_invoiced_report_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/adobe_flash_animation_software_free_full.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/cavatina_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/pepuvukotuwuvividege.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/kimyasal_formuller_ve_adlari.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/cuckoo_series_3_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/zuwitudepi.pdfIn PDF document text
    • http://mimumugemefes.epizy.com/megikavedafim.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_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 5340 bytes
SHA-256: 12ecc13593714165bdba9fcd93eba9fe8ba0512e65734fd29e992128da6bd828
font_01_sfnt_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10156 bytes
SHA-256: ec65f0af8ea7f1286f90026ca8a86c4ecba4e2bb310aa5592dc222153d5c2ab1

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