Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccb5346cf55f191…

MALICIOUS

PDF

82.7 KB Created: 2021-03-13 19:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b0396e91db2f32410b1f59ee66cb82f SHA-1: 4433296ef8142cf32986d32276ef2cd4ceda3873 SHA-256: dccb5346cf55f191329f495e55330ddfc361422da960e0257bdf93520dd1b9a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=introduction+to+information+systems+8th+edition+ebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384645/normal_60314a846b13d.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/bNZ4n9R/final_order_band.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/weight_loss_workout_plan.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/xivalud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5ff24c7dcd951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_6026afedd9b4a.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/EheySdK/rulapis.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jp0hgjd/hill_climb_racing_2_online_play_plonga.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/the_pillars_of_the_earth_xbox_one_gameplay.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/45804823849.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/engineering_drawing_orthographic_projection_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_6045ff61e91d9.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/922fe61a-cf59-4362-b9dc-e05568954bfb/identify_the_difference_between_bacteria_virus_fungi_and_parasites.pdfIn PDF document text
    • http://xasagode.myartsonline.com/como_calcular_distribucion_normal_estandar_en_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85689522-9bad-4c66-9f0f-13a5c5c7cd1b/meaning_of_stairway_to_heaven_yahoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3b0850-7cd9-4222-953d-ecd31417fbda/beats_solo_3_wireless_gold_matte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7157a00f-799c-47eb-87d0-b0bd92f9dac6/geometric_formula_for_ch4.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/positive_effects_of_volcanoes_on_humans.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 5668 bytes
SHA-256: 9d493ef46d7febb6cd50db0da789225809c32780e2e5995d7aed77707cab72b9
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10796 bytes
SHA-256: 38546873ff6d557716f4dc192da46037ee40c617877c2cc83714924f2a47116e
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 16084 bytes
SHA-256: 6049f7be1eb58524b2bfe5e0ab34f4300347f26dbb23ab6ad605e3b0d5647553