Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba2c0a3b931a1f3…

MALICIOUS

PDF

93.8 KB Created: 2021-03-29 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d6784183a04e874f4236a4af3fefedf SHA-1: ea77f4cc5568761e55f1cd1b9600fde5049bc9ea SHA-256: aba2c0a3b931a1f37e1ebf2ab5f820cdc61e0c23c26e4033944f0d139282d63f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://baarspo.ru/strik?utm_term=monsters+vs+aliens+bob+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377706/normal_6050f85e4a5ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6026a3bdc0a99.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/dgd0Dhh/zombie_slayer_hypixel.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/farm_to_factory_thomas_dublin.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/digjcjb/zomogiximejunut.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/bidxpid/technics_quiz_weapons_of_war_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/aibiepi/24078566274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vetozidute.rf.gd/rolelisanubarozuzitasunek.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_7ed6457b0bec4b6b888107a8235e6ecf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c5398d-1a5a-4c18-af2d-3dae6a54f16b/english_for_business_studies_vocabulary_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3329e27f-905c-497d-986f-1371e42a62b4/what_are_the_12_basic_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78487baf-79a2-4d66-8038-e7a01eca2e6e/dell_optiplex_9010_manual.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_af960f4e93d040488b53f77fa6a97ad9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/63864108535.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/would_your_be_capitalized_in_a_title.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_9984a0962d79428d8eaefc192a65784f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/kibevumo.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_1a9fa41c5e9945349bcf052bf44b3f50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e7d168-d75f-41d1-8e0b-5629755f2561/download_full_oxford_dictionary_free.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_off00013407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 5008 bytes
SHA-256: 10076eeb69ac7c12c425d43cbef2070a7aecc024e731f70c3ddb1bdd3871fb0d
font_01_sfnt_off00014534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 10716 bytes
SHA-256: b0bfa67b1a813960570090836834e612275a9633f46e44790acc8f4cfe156ebe

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