Malicious PDF — malware analysis report

Static analysis result for SHA-256 670a16782b0d9900…

MALICIOUS

PDF

74.8 KB Created: 2021-03-13 12:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d709552dd0e0e3cb1f73cde557f717f SHA-1: cd87c6855dfe931133e79c2dfa681407c4c20064 SHA-256: 670a16782b0d9900411d5f317bfadfbedd1f7bf50b6c32d866b979d0b3f1487c
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 0.9997

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=compound+interest+worksheet+algebra+2 PDF link annotation
    • https://cdn.sqhk.co/wixefawoz/dzheheQ/superhero_fighting_game_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/fmhe397/infection_prevention_and_control_strategic_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/begejd5/special_forces_group_2_apk_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_b8b8f93de3454b118756fd5037c0e6ff.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_8097e0be1ed144cf878f1902a07579b8.pdf?index=trueIn PDF document text
    • http://danebusuji.onlinewebshop.net/gajiwelowidojoronipapa.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_e3e8f867bdc444f0bea061e41d66fde6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2a3124-bb09-49c5-82bd-2d6e3b5f6c15/longman_dictionary_of_american_english_free_download_for_pc.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_31d33c9f9a38439f92f638ecba73ce72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/jezun.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_062b715a9409435d889ffb1c5f16ef58.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_007cc52a937f4553bebc7eddb8780c3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/717bb1cf-2e94-4bd3-ace3-b2a8807608d6/did_colt_stop_making_the_le6920.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/how_much_is_10000_naira.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/75257634669.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_3e09d6e1792044b385880aa4a1f4b8ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizufapu/libros_de_matematicas_financiera_gratis_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/the_biology_project_karyotyping_activity_answers.pdfIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_c943f3e3745b4d94859fcd18c95d13f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/diboxeruwarajavibu.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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 5708 bytes
SHA-256: ca65cb227428ca87e142cf67b208eedd1b608e3a5066e10454dc140edaace6a4
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10844 bytes
SHA-256: 193bc6e9dc2058fa45c63c2fb5e6bceaae673536057ee2773fefb652dca9f317