Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e32866e720cacf…

MALICIOUS

PDF

69.8 KB Created: 2021-03-16 08:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16af9165809cdd88a9112fbb0f046d09 SHA-1: 1589878b102bbbe8605d5702eb657c07df8e49f1 SHA-256: 77e32866e720cacf8a48e054236699082f8d65a7e5f3fe1a49d65eb6c2b81672
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 0.9996

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://gimoguvi.ru/123?utm_term=caping+gunung+ayu+lestari PDF link annotation
    • http://xruhdfo.site/capitalismo_e_socialismo_resumotl8xc.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/xenuge-kejik-wazufapudipijo-dufavekuma.pdfIn PDF document text
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/dozafovapagavi_xojovuviwisut.pdfIn PDF document text
    • http://poroda.site/25576508803ap3zl.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/0bf1d265.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/7ab0e296b650a.pdfIn PDF document text
    • http://regsen.website/telugu_movie_quiz_questions_and_answers_2016p9q4h.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/nabutofinidezi-kigesefemibor-getegogirosef-gopazoperare.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/zunavatit-bazagilaxo-derasomukubibu-mutodub.pdfIn PDF document text
    • https://japosazononugad.weebly.com/uploads/1/3/4/5/134583509/6091571.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/3682200.pdfIn PDF document text
    • https://suzabotofofetab.weebly.com/uploads/1/3/4/7/134739937/5d93f9b4a8.pdfIn PDF document text
    • http://8gusevshop.space/segmentacion_de_mercado_philip_kotlerhokl1.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/basefexazepave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_14773ab7af684dbd97d7863b15584363.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58eaa70d-c5db-477c-a95d-bf94b4b529c9/terixepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6a3c35-bbe3-48f7-b491-d0ab3adeb35b/descargar_contrato_de_arrendamiento_de_vivienda_urbana_minerva_gratis.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_9ec0634f9d7c4fbaa0795f45ec409773.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3d4ab9-d3bb-4619-86a0-f37ce828463f/harry_potter_illustrated_3_book_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e708f8-a535-46f9-b23c-19efb9b8719c/punctuation_exercises_for_class_5_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b94a77-18cd-4321-9736-b93a8a922c2e/dugimawovipa.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_d66de18ae92342279e5d9b4eefa9be75.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_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 4996 bytes
SHA-256: 02340a7d8412d49f87f8a007de301566ef90ad66ef2fb0f026fde7b5454c9219
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 9980 bytes
SHA-256: 26c55a1a03f14393d932bfb7131aa2f143219106b838fb9cb619851e698373ce