Malicious PDF — malware analysis report

Static analysis result for SHA-256 2424a704f54c4a76…

MALICIOUS

PDF

113.5 KB Created: 2021-04-04 00:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 573fedf1d8ee11e210bba81cfab64bc0 SHA-1: dbd652542b98473dcc9d22a32c4be08c7b18d5a3 SHA-256: 2424a704f54c4a769706781717983b4abaa35075c52c1ef99ec9c8540760f49f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, and includes a 'download' button lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=pmbok+6th+edition+pdf+free+download+pdf+arabic PDF link annotation
    • http://sikakapu.medianewsonline.com/fulix.pdfIn PDF document text
    • http://zespodsvetkoy.site/logo_quiz_online_ukn6z7l.pdfIn PDF document text
    • http://fakts.design/how_to_eat_while_pregnantx84xh.pdfIn PDF document text
    • http://ludshop.xyz/diy_gun_concealment_bench4skll.pdfIn PDF document text
    • http://wetiludivarag.scienceontheweb.net/67623685370.pdfIn PDF document text
    • http://danifewikusi.scienceontheweb.net/tre_et_avoir_au_futur_exercices.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/32675021724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adb439b-daca-4bf3-8b52-5fe85eafef1e/bosch_500_series_dishwasher_shpm65z55n_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3decbdf-5290-451a-982a-c39a866a9de7/lipumudabileluzase.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_cc4dbfe0dfc9465d86b7683374bc31b8.pdf?index=trueIn PDF document text
    • http://fidalanono.myartsonline.com/nikon_coolpix_l22_full_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12c182f-b422-431d-8ae4-04249581a9a3/what_is_microsoft_core_cal_bridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a8eca8-8129-4a72-81f6-cc2300433a56/pokemon_red_map_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e48d23d-1c69-4da4-ada9-d7c7cc86cc99/best_way_to_build_a_shooting_bench.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/how_to_reset_asus_rt_n66u_router_to_factory_defaults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ceafe0-7e51-477f-8e6e-10d3c0e7329c/calculus_james_stewart_5e_solutions.pdfIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_de4d4286a89c40068ed00470ca502572.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec8b324-2649-400f-9059-6091078c4a7d/how_to_use_shark_press_and_refresh.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/android_auto_video_player_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/biblia_hebraica_stuttgartensia_de_estudio_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5571136f-4797-499d-bf8b-6befbcf90ac4/how_often_should_you_change_your_oral_b_toothbrush_head.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_3bdac2391c1b4faebd05e64cf0e1ee74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/gramatica_inglesa_gratis_con_ejercicios_resueltos.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_d0354fbbaff74172b14ba38a40da09be.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018cf6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18CF6 22940 bytes
SHA-256: 5cdc6936f1b138a5aba2e09033e06d68894d71c2be02cb23d5fb212b78c24a2b
font_00_sfnt_off000113f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 18736 bytes
SHA-256: 695d619a0e0e27282c1361ecf9f6a8f5286284cdfe568bdd521161cea443f805
font_01_sfnt_off0001502a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502A 5668 bytes
SHA-256: 887355bd70960c1c96f6e94f42698331298459761aaa1d20383bb91587057e00
font_02_sfnt_off00016356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16356 13204 bytes
SHA-256: 689d9dd7f6d4950a02598d0eaaff65272aec5b55962327fdc19f53b3ee974a0c