Malicious PDF — malware analysis report

Static analysis result for SHA-256 479dc99f76052b7f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 11:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b37b0a1d8d9f5392fbbb41223559dd5a SHA-1: 18684283c3b1aa01d09a6930ad5c8d83710fb5b6 SHA-256: 479dc99f76052b7f1f663dd175f0a7f68e78b08391171e2308c1fc34a3694f22
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 0.9993

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://bologen.ru/award?keyword=apologetics+study+bible+pdf+free+download PDF link annotation
    • http://shop-profildoors.ru/tcp_ip_model_layers_explainedm4s4q.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/nubizadedafamemepofasof.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/how_to_connect_hp_deskjet_3050_j610_series_wireless.pdfIn PDF document text
    • http://mgacessoria.online/how_to_make_a_climbing_training_planrdbz9.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/3291250877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418362/normal_5fc9a7d4add5e.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/python_projects_with_code_github.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/how_to_install_honeywell_wifi_smart_thermostat_rth9580wf.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/novena_al_arcangel_san_rafael.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_602555272a6a3.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/similarities_and_differences_between_arteries_veins_and_capillaries.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_602fdd53266d7.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/didadizevizujisizigaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600c944a311b6.pdfIn PDF document text
    • http://homiak.fun/significado_de_hemoglobina_corpuscular_media_bajayohhf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_600761bcc4393.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/4ccb8c32-774a-47a7-8b02-1df13520fe20/nissan_bcm_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46e667b-75ef-405f-a588-7056aab85340/85739619619.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/formule_chimique_bicarbonate_de_sodium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe0a112-24b6-4852-9b27-34177b352aa9/questions_to_make_you_fall_in_love_reddit.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/absorcion_de_nutrientes_en_monogastricos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c40926a-0239-4245-b821-20f167bd4ac2/hohner_chromatic_harmonica_cleaning.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/60588459832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b06c4f-58aa-4b06-a2ab-91d0ffd29d17/my_online_light_is_off_on_my_modem_spectrum.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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5648 bytes
SHA-256: fff60a06191901d73bad8a78fdec664b8bb62c54a92fecbc0c2bfcf4fd763326
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 11508 bytes
SHA-256: d04b9f5176adf60697e03ebdbcfb6a5bbf6e65bfbf2f740ec219160bdeb77999