Malicious PDF — malware analysis report

Static analysis result for SHA-256 935112e26c7e6fb6…

MALICIOUS

PDF

69.8 KB Created: 2020-12-17 21:30:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae93d4f74dc2a38edff5f4c7f780aa4b SHA-1: d6c800d92b49b74afab7741229f5fa00ce82f0dd SHA-256: 935112e26c7e6fb622532a020cc00c2859883d8b81fd996daf628bb156ce3549
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malicious content distribution intent. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=generos+discursivos+pdf
    • https://domenotupeloli.weebly.com/uploads/1/3/4/6/134685365/090769b30.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/940166.pdf
    • https://cdn-cms.f-static.net/uploads/4454977/normal_5fa37d978adaa.pdf
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/20f8c96ad.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5fb676555c060.pdf
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/nifutol-labamipoxid.pdf
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/feparenopazude-mibonopuv-judew-zumobusatopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11e173d9-4f92-439e-9c32-729a163f1fb3/18382921291.pdf
    • https://s3.amazonaws.com/tubupejevomo/android_emulator_network_latency.pdf
    • https://uploads.strikinglycdn.com/files/7e9e2b4d-2a7b-4972-8035-4974702f2111/problemas_de_areas_y_perimetros_1_eso.pdf
    • https://uploads.strikinglycdn.com/files/18c90ff8-1acc-47cb-a107-83ae207d6a62/eagles_game_score_tonight.pdf
    • https://uploads.strikinglycdn.com/files/f83331ff-5826-4936-b2f2-7255ce685864/the_bond_book_third_edition.pdf
    • https://uploads.strikinglycdn.com/files/21804903-0221-493e-be2f-72b7ea9a6744/nimufuranijiguson.pdf
    • https://uploads.strikinglycdn.com/files/a8dc0a36-0eb4-43d9-96b5-da8a3204c589/70636982358.pdf
    • https://s3.amazonaws.com/dowavelaxam/mindy_kaling_books.pdf
    • https://uploads.strikinglycdn.com/files/89675156-9f2c-4dc7-af99-aa18faaba592/free_coins_for_solitaire_grand_harvest.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37c.bin
057121c745b2420b2e1284e938e4ca45ed58eb3c97413c412dba0a546f516e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 4996 bytes
font_01_sfnt_off0000e49a.bin
c8acb40a0431208af6bb8eaae48e3e1c7fda715b17f02593b173672a181a2b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 11756 bytes

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