Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9931b9db1ade7a…

MALICIOUS

PDF

81.6 KB Created: 2021-03-15 02:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a51976356f746ddd0f1d832835b4d475 SHA-1: e6ba37692226d71ae22244b7912241a96c63ac2f SHA-256: 7f9931b9db1ade7a72521c463068cdf6e7cd6a6e701a5ca30b1c2da63be5df5a
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 0.9995

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=linking+verbs+sentences+examples+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418000/normal_602821faae4e9.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/lutatawinabilufapetiw.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/wages_of_whiteness_table_of_contents.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/my_cloud_home_setup_mac.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/hewlett_packard_laserjet_4050tn_printer_driver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_601a2c33a1ba9.pdfIn PDF document text
    • http://felagem.getenjoyment.net/afasia_global_adalah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_601e3cfa2718f.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/beej_network_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_603f086bb0ebb.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/39710036947.pdfIn PDF document text
    • http://muzalovoga.22web.org/what_is_chemical_weathering_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowetuxamu.rf.gd/remington_700_sps_tactical_magazine_extender.pdfIn PDF document text
    • http://fotopokidag.epizy.com/95600032577.pdfIn PDF document text
    • http://ruvaseravijuged.rf.gd/perufalawogupesesote.pdfIn PDF document text
    • http://faluzaxubip.epizy.com/breville_smart_convection_toaster_oven_bov800xl_canada.pdfIn PDF document text
    • http://tafaredos.rf.gd/risk_matrix_score_template.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/advanced_trainer_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2207786c-884e-46c2-afa8-a9e974f0d4ff/kefijeg.pdfIn PDF document text
    • http://jatijadimob.rf.gd/85874120884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44e557a-db2a-4e2b-8bf1-6803ad9f8290/9369208807.pdfIn PDF document text
    • http://mukonedes.epizy.com/fagobibixotipopuramu.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_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 5528 bytes
SHA-256: e2e5e976a0f9ba39fbce9e79f713b945655c7e68cac5705918a7bc9235fe41d8
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 2012 bytes
SHA-256: c744a51b48d596f672cd233ead2463e7bb698a55b355cdb5fdf8ef887681b55c
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 11088 bytes
SHA-256: 5d5eb33e93a27c60c6d3f5672e8dc99dae39226d13868309c1c9e64775b9f554

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