Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4793fbe26110b34…

MALICIOUS

PDF

87.6 KB Created: 2021-03-15 17:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: caa2caf0864465e7d571ed05b19852bb SHA-1: f7498033fc13d5e42103aeb137abb336837549cd SHA-256: a4793fbe26110b3459a722e61393fadb363fcfd5eb02d99ccdc6c76a6a0893ed
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. This suggests a malicious intent, possibly for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and numerous links point to a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/5347586.pdf In PDF document text
    • http://smartycredit.info/how_your_body_heals_after_surgeryyfx5y.pdfIn PDF document text
    • http://vigastlens.xyz/movimiento_parabolico_de_caida_libre_ejercicios_resueltosnhd5w.pdfIn PDF document text
    • https://vezudarelewik.weebly.com/uploads/1/3/1/4/131482962/wugila.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/foGiet3/battlefield_companion_app.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/gcRsgiA/97553026964.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/vertical_centrifugal_casting.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/3b6222.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/jcgfhh2/wutiz.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/hdo9ohi/soviet_space_program_fatalities.pdfIn PDF document text
    • http://detonicro.website/kenmore_model_253_parts3a1pb.pdfIn PDF document text
    • http://allerop.xyz/285234170958eba1.pdfIn PDF document text
    • http://znakomstva69.space/alfreds_basic_adult_piano_course_lesson_book_level_onece1dq.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/36611071028.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/wineraso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/razvivatel/yapz/~3/-MXWpcYQ7kA/square?utm_term=star+wars+canon+timeline+books+and+moviesPDF link annotation
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_da2315e4576a409fa551ea2697f3e18f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/5654045216.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/charlie_and_the_chocolate_factory_online_book_with_pictures.pdfIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_5e606244691c4de9aa9e4d2e6ee9b9f3.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_65a5e8c55e4c4c16bb843539cb712712.pdf?index=trueIn PDF document text
    • http://rawegutidum.onlinewebshop.net/fistula_perianal_tratamiento.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_41dc43745225433ba0713d74b02d74d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/the_selection_series_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/bivenuganudanovasoraxoguw.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_15b7470a33b34b25a883ebfe705f9831.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 5544 bytes
SHA-256: c6cde8270b1329571a1b5a79b54f183c979a648c8aea98c92ee65ddc7e043af0
font_01_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 10968 bytes
SHA-256: 4b247f774ef1e0fd033d8709e6773a7a6ab747c6e6252bb7846d2fd1e2d9cc97