Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8099ae1dcff5b2…

MALICIOUS

PDF

81.7 KB Created: 2021-06-01 11:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 761812f32e08070cf0453ec7795807c7 SHA-1: ce1797a24969db22fc17cbdd05c17600453e0db9 SHA-256: 4a8099ae1dcff5b2e0304f28e4d42d1e3b0272229ccdf5aa9530c680da122d43
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain that appears to be part of a phishing or link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=what+does+df+means+in+ac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fdb99d889703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_5fc8164b00035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_60689d4edf4a1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404964/normal_60b1464a39671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_604ebf9af20df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_6067342daa3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_602ed279314ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fcb2187eb41c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_6064e2dc2b657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/18e1e187-e9df-451a-ba12-2e7a840ca807/who_are_the_voice_actors_in_pokemon_sun_and_moon.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144433986/lafupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117a6155-d182-4310-b4ed-df4fd2560c02/vivavajeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcd18cd-f7ae-4b47-9e18-bd5ee40e670c/tukixutudegomimulab.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/5942055893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcb2ee2-211b-4782-97e8-915b5454f178/88123367320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b52f43d-2c62-498a-908e-c366858de6b9/nomiwurozusazesiwoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7ced24-f064-462b-a774-db9b0f7154e6/how_much_does_brinks_truck_cost_to_repaint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c508cb8e-8a8f-4854-bc1b-19439abf1af6/braven_brv-1_replacement_cap.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144427698/uc_browser_for_pc_windows_10_64_bit_free_download_softonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de3babc-db31-42e0-b788-194cafd884f3/zonadegafodor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1c19c4-ffa1-40a7-9930-442823ec93ec/sagepomotogofazo.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/onn_bluetooth_headphones_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe3690d-be5e-4806-8384-244f13ef38c6/how_to_start_a_theme_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d2053a-8e59-402e-b6c7-c90c6c750f58/every_heart_a_doorway_quotes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 4932 bytes
SHA-256: efcfd68c89a873d8512435f8f5f14fa27050fdb6cfe79fa08623171e414608b9
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 10696 bytes
SHA-256: 710158dccabf88f32b6a274db736a12b0479b2b28bc6ca50cbd22615fdcb6913
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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