Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0448016d448c1b4…

MALICIOUS

PDF

70.9 KB Created: 2021-03-18 19:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f9498fee0ddf8a53b88501211c919e27 SHA-1: 55a2cb32df966fbbb4e2e2bb2f3d46e060c12f3f SHA-256: c0448016d448c1b48548d8823dc544655579627100f05f2bed9394a43a7a624a
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 0.9991

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://resalured.ru/123?utm_term=causative+form+advanced+exercises PDF link annotation
    • http://all-host.site/my_talking_tom_2_mod_iosrwmb8.pdfIn PDF document text
    • http://gufutaca3.xyz/pixel_starships_crew_ai_guidey2pct.pdfIn PDF document text
    • http://labincom-med.ru/96627437693pnfme.pdfIn PDF document text
    • http://sakhavto.ru/free_printable_college_level_math_worksheets_for_autisticixtcx.pdfIn PDF document text
    • http://ndfnasg.xyz/dumpper_and_jumpstart_2019qtx8v.pdfIn PDF document text
    • http://organicnu.info/cnet_iphone_8_plus8oyim.pdfIn PDF document text
    • http://gsmall.space/west_bend_stir_crazy_82707_battery4786u.pdfIn PDF document text
    • http://saudiautoinsurance.com/gituzapumagy6fd8.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/e471ba79-5526-497a-8a30-aacc8f73543a/wuvujevasevapudekipivel.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_1c9604f915e04d05b064305cbb6f6ba7.pdf?index=trueIn PDF document text
    • http://gisaxuzarufol.epizy.com/candies_platform_boots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2e3db8-0bfc-4616-ad5e-f24a0f3cb358/38827682761.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/ahmadou_kourouma_soleil_des_independance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c39e2b-c695-494e-94a1-021e70fe38cd/32741260088.pdfIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_7bcd086695ed4664a11fae155eeda86e.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_eae835ebb52a41ad91aebed0a48fb03f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/877ba8fd-dc03-452d-bed6-613a8559dbbb/what_is_quantum_jump.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_dbf798e51643486a9e6ab8e10e700dee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/metformin_pcos_without_diabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/82821295606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a2ad3d-6853-43d7-bbf6-96dc3eb6f0e6/finib.pdfIn PDF document text
    • http://zosejanukapub.rf.gd/biblia_de_estudio_de_la_reforma.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_5bec4bbaaa75413eb3ba7ec31a01b87e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/android_material_design_back_button_icon.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5168 bytes
SHA-256: 2ca6f913e7927f7e4f23e99ce5de95dead3544b55e8a6b0b6cac1e8e09cbedf1
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10484 bytes
SHA-256: ddf073817cfa927d945b1218276ae928e5d78198efeccbecb5061cefbba77fa4