Malicious PDF — malware analysis report

Static analysis result for SHA-256 db042378700bc1cc…

MALICIOUS

PDF

86.7 KB Created: 2021-04-03 13:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9569d8d298155b2df23f02034b5a7bbf SHA-1: b3572a4af732eb5711217fce12f89e5ce7fb2658 SHA-256: db042378700bc1cc4ee4b2350f6ee3af358bcb65c8c2265ce32550ef94f042f6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing an embedded URL that directs to a resource seemingly related to academic lecture notes, likely a lure. ClamAV detection and ML classification strongly indicate maliciousness, specifically a phishing or trojanized PDF. The presence of an external URI and the overall detection suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=advanced+econometrics+lecture+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/numisezopo/ggms25X/problemas_de_aprendizaje_segun_autores.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/ghoCaid/limbo_rock_song_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_605a5e9e9efb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fe560679d57b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fe4c5b96d881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_604cf41f13ab9.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/LhaIjbb/the_walking_dead_michonne_android_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/dierijr/o2_saturation_98_percent.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/heRsljc/ladunubug.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/kwuhiha/lakupuz.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/bieijVP/42211554547.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/e5ggieU/31401519364.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuvebafo/giOLqOz/maintenance_work_order_tracking_template_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5fec57c0db100.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/8hieVG2/gewolufoduzibaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/QgcdZXm/lozufofudokivaf.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/vabedafozo/37829414162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc8de77-eb0c-427f-a221-795344ac36a4/gawexosaburerafidikuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/mawewazedu.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/67579418980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c8d89a-5535-463a-9399-ab9bf05c533f/mapudazifuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b81976-582b-4c3f-9137-a4aa1a10e8f5/51006005219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c80bd6-2293-48db-9bc8-d2711943ed87/41390181596.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/fafufibujumonaw.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_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 5352 bytes
SHA-256: a8624c9792dde247680664df5170ebca6e9d0b244cff3d29faa7c1a6d7a35a3a
font_01_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 11456 bytes
SHA-256: 90e657bb9c0dc83a7ba31aa19573b3a4c5f718861cfa5ab3de0fc4e2b2a94f7e

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