Malicious PDF — malware analysis report

Static analysis result for SHA-256 942c5cfd557455bb…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 02:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f9a12ed7d6bbfbb5cf237fb345c7fe91 SHA-1: cada6c03697036775b8c5954492f1f9d99ed16f8 SHA-256: 942c5cfd557455bb9346b8cf00b4696e1ce773ab2bd49defd7de94bd792c79cd
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://crophysi.ru/wix?keyword=trig+word+problems+worksheet+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_5fd85b12d5ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/jggi4mQ/real_football_manager_320x240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_6004be4b56504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_6013dce27b207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415783/normal_5fe2a0f625a2b.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/viludirufezol-remez-kazulikakesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_602a7c358976b.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/viromibukoleliw/69701764264.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/brute_force_wifi_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/49604443355.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/descargar_3dtuning_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/fretless_bass_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/smokepurpp_audi_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/hitchhiker_s_guide_always_bring_a_towel.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/sunapavomepulubironid.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/foliwevaveloredub.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/32456616962.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/financial_reporting_council_of_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/les_personnages_dans_a_la_recherche_du_temps_perdu.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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 5540 bytes
SHA-256: 00c7fc882119ae9315f2c37d5f7af2d6659c8090d3d31ae1e1933ce11b511c33
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 14376 bytes
SHA-256: 0ecb49ed19849102f7087a8ab57b6506cf24dc4dd8d9b998e6925f3f692f8d59

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