Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe3e64a4182d1ad…

MALICIOUS

PDF

69.0 KB Created: 2021-06-04 04:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 651e5b8942b35155d04c529d7c28eede SHA-1: e2db84ae47a6d683ae0cbc7fe35dc8c29d2d8b0b SHA-256: 9fe3e64a4182d1ad957ae0d509d69c1f04ec9a91951e82cb55f91c0f83c4db5b
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 0.9993

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://chcial.ru/pbw?utm_term=tri+fold+brochure+template+microsoft+publisher+free PDF link annotation
    • https://pelepidavivi.weebly.com/uploads/1/3/1/4/131454492/46785.pdfIn PDF document text
    • https://ralutadepijug.weebly.com/uploads/1/3/5/3/135305627/4c649bde2.pdfIn PDF document text
    • https://xalokelunubame.weebly.com/uploads/1/3/1/1/131163690/546829.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/736720b963d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lufokomarib.pbworks.com/f/foridamisuxesasuzaben.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144414483/economa_bsica_rodas_carpizo_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f522229-f55b-4700-9697-4d9fd1b0c3a8/aspectos_que_se_pueden_mejorar_en_una_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6715e6c7-56aa-4e8f-ae6f-9f3144210051/dojinir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce98b2d-0177-443d-934c-a287c5a72768/half_lives_of_iodine-131.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144585048/tebevoxorafuvunozixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715f2a3f-ff76-4c8e-93c0-76f9b4a7e76b/34673925621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5046e02b-e26c-49d6-af48-0162844225ce/wemarobovofugumasosoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454ec61a-0ac3-4f4d-8ec9-25db51bfc968/how_long_to_smoke_a_12_lb_turkey_in_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156fe692-379c-464b-b1ba-9c34209a8cc1/charles_dickens_a_christmas_carol_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9399e2-ed8e-4dc6-9fc7-f32a63828821/mifusog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ac8753-dcb9-4ec0-a724-713cb7763b09/60852164515.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144423225/what_are_gradable_and_non_gradable_adjectives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9871a7e7-4ce0-48c0-be89-3e642515e06c/learn_python_programming_masterclass_tim_buchalka.pdfIn PDF document text
    • http://degagogo.pbworks.com/w/file/fetch/144587307/94045099326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01c4804-4a8e-4a69-bb75-71048a3d8964/koxupowavaresim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587d4372-5d6e-46ee-9697-25ef42e2eeca/jopugelipobupevuselu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040278c5-1f48-4a8b-a318-f01f0c630d21/powete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1105867d-4355-42d0-84fc-b80f8d46a4cb/marvel_comics_news_2019.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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 5484 bytes
SHA-256: 1d70cb545da6b77c4022198cdfb4e5a882893904e98cee38353cfe44b5d7ce36
font_01_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 10188 bytes
SHA-256: 437d36b33d150ccc5c7511b541733eba5bf6c8dd35acb8449cd472a465c0e4be