Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ec3953ecabea29…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 21:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a3c390312d012d31cada234a583eaf9d SHA-1: 53fef39cbda04bc0bd545b2c11cb3f298d27dd3b SHA-256: d2ec3953ecabea298caa3474222b2439f19c4090e36471f18dfef33fabc84084
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, with two identified as potentially malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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://resalured.ru/123?utm_term=persona+5+irritable+answers PDF link annotation
    • http://bimoriz.getenjoyment.net/vonimuwoxuvatelivufukijuv.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/zegalipuvutadubokejukevi.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/bagelajaletipofilal.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/certified_six_sigma_master_black_belt_handbook.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/liwara/govaxupafu.pdfIn PDF document text
    • http://wupafar.rf.gd/bully_obb_ukuran_kecil.pdfIn PDF document text
    • http://pujusojup.epizy.com/classical_gas_piano_sheet_music_free.pdfIn PDF document text
    • http://suxanovovogemi.rf.gd/behringer_x32_core_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb6bd30-3ae2-4c07-8388-f0ab28eefb5e/wasirugabuk.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/bekunininagadinoponejuga.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_b7a0ee574dd14aae8e0b7d9bdc17250e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d91e8a6-18c3-4486-8b70-8a09f177775c/how_to_draw_beginners_free.pdfIn PDF document text
    • http://pekamidakoj.atwebpages.com/dirt_devil_easy_lite_attachments.pdfIn PDF document text
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_93361cde50af41fe977046ead64595ce.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_11000fe50f884a3c9b895e8e889a11c3.pdf?index=trueIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/why_wont_my_jeep_shift_gears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26956588-0681-47ad-aa3d-1829cc1aeabd/9318505133.pdfIn PDF document text
    • http://bewalixatama.epizy.com/2667161330.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/xewurepedaxapinulo.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_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 5036 bytes
SHA-256: 92dd65a47ac24d6ba816cea985f254b9312fdff34c95dfb9063a63cd7176c12d
font_01_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 10480 bytes
SHA-256: a83ae6f35aff7c7ffc1155c3066179f09aeeb1f12447dae58a6ad5c72771ff04

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