Malicious PDF — malware analysis report

Static analysis result for SHA-256 d570a0ed232d39d4…

MALICIOUS

PDF

100.2 KB Created: 2021-03-17 12:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61486317121934b6097a3e1c2a6948c8 SHA-1: 2b4cc1a83855443ce9a08c1c43f32c7216120045 SHA-256: d570a0ed232d39d46adc0c2a46b3dd2089974842747ac345c567757ac742a8af
186 Risk Score

Malware Insights

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

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 0.9949

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/123?utm_term=alcoholismo+y+drogadiccion+en+adolescentes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450244/normal_601e7afd9726e.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/99572287174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5febd0d89191e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5feb3361032ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601b26c1400ba.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/can_chainsaw_chains_be_sharpened.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/tekotefib.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/how_long_do_tracfone_minutes_last.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_602d79a42da35.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/duguxawapososozigodosipij.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/sodupijevawevurogu.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://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_29f2d31fe0d94903a87fa3e8df8213ca.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_104a250fbe8b4f08a4eee0a030b1a12b.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_e4755b2fc1344e9ebcc48258b135d02f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e020aa6e-7c95-4cb2-b9b0-b16430f1ffa3/faxomeguvitalix.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_6224e8e6ea1a462fad638f4179555ad3.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_8bd7e667299e4c7e961b17b02e809efb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2cd79a-95b5-422f-b5c8-dfb3fb576788/how_to_set_the_delay_timer_on_mr_coffee.pdfIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_e3f767ae8f924c7cb0ba248c564e8426.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_6bc94096a48d4b7db6197694af812667.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/622e086a-b85c-41fd-94fc-180a85412334/zebra_gk420d_printing_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f447f04a-c216-41b8-8309-530f2f5e8ad1/taylormade_r15_driver_adjustment_manual.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_3e2124daa3ef4eac859020b4937b8c09.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_d0a6b436a2584c3a8963916d897841ac.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_edc2b6a683344c328548268676167fe7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82dc9a6-7217-446a-b28b-104d6a525d06/81874998960.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_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 5448 bytes
SHA-256: bdea73d766d3056c79e4a5feee28fe6ab805ff0e657f6625306af5fd3d588daa
font_01_sfnt_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 12680 bytes
SHA-256: e25f64fda2731d0fc4c9817474660e31dc50b538ea104ae42fb2692f51754678
font_02_sfnt_off00017328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17328 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361