Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f66e75ebf4973c…

MALICIOUS

PDF

75.4 KB Created: 2021-04-12 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d8cc56f7c7ec0c63ea05ffce801c79c1 SHA-1: 4bc9ec6d861d0e6419f3628d559a7af577373767 SHA-256: 83f66e75ebf4973cb481f6853ab68a764b7b65823638add71db92da16547394a
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, with one URL specifically mentioning 'sap inbound delivery type determination'. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs and the nature of the heuristics suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=sap+inbound+delivery+type+determination PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366000/normal_60038f339db46.pdfIn PDF document text
    • http://usacreditmonitoring.info/webogufewenobibamoboli4vakm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5fe30bf688449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_604f92dae0dee.pdfIn PDF document text
    • http://samettemiz.xyz/18332402667yi44r.pdfIn PDF document text
    • http://rentline.pro/fixawiko46vrz.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/58963813241o3sa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_6058bef054907.pdfIn PDF document text
    • http://worakozun.22web.org/jejixexasuwodux.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/missing_411_ebook.pdfIn PDF document text
    • http://nakanilo.club/manette_wii_ne_s_allume_plusphqu1.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/7626548371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37738444-1007-4ce8-bbc9-9637d0f9c3fb/figufozopotepudi.pdfIn PDF document text
    • http://limirosu.rf.gd/comparative_superlative_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff801b1-6b58-4133-9d93-81d774295bd7/the_hunger_games_catching_fire_full_movie_free_online_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e60f86-389d-4dd6-b5c7-a30607c4b750/3534368200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26124e3-67a7-4e40-bd06-bbd7af4b2900/trimet_bus_48_schedule_sunday.pdfIn PDF document text
    • http://dopovis.myartsonline.com/english_file_beginner_teacher_s_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134ee89e-2393-48dc-a661-af7105499ce4/63148082825.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_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 5332 bytes
SHA-256: d90c4af8b47cd6ca520b276c805fe3753a24dbd9299a098eea41402f902c644b
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 10428 bytes
SHA-256: 1d59ed291060f60bbbee1d1bb140280c4a76cd2014e7ee52cb927b35a4b005e9

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