Malicious PDF — malware analysis report

Static analysis result for SHA-256 8341c86bd43bf7af…

MALICIOUS

PDF

101.8 KB Created: 2021-06-13 04:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 17bc7cd3c480518e974ea6b2b94ae5fe SHA-1: b806ad726c7654371c93b5439f1873de9d6877ba SHA-256: 8341c86bd43bf7af6fb30e795dc28ba5b672508c3fe62b4d993c637e360614b7
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 0.9969

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=arduino+programming+software+free PDF link annotation
    • https://xofokoraziv.weebly.com/uploads/1/3/4/7/134748977/belikuviwef.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/fcef6a65e79.pdfIn PDF document text
    • https://kalozepi.weebly.com/uploads/1/3/0/8/130814360/bbf6e496c588.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/7792582.pdfIn PDF document text
    • https://giwemonuxir.weebly.com/uploads/1/3/0/7/130775654/be867a4ef3d63.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/8138137.pdfIn PDF document text
    • https://bofazoxoniwepiv.weebly.com/uploads/1/3/4/4/134454835/2163886.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/f44fd45a897b283.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/363857d3.pdfIn PDF document text
    • https://viserewisesu.weebly.com/uploads/1/3/4/8/134886384/gagutakulux_beduter.pdfIn PDF document text
    • https://ledewamigov.weebly.com/uploads/1/3/4/8/134850019/6410759.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/kuwawavevexo.pdfIn PDF document text
    • https://fogepiwutakeru.weebly.com/uploads/1/3/2/3/132302718/kitirur-suxibutajina.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/wijape.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/fuxume.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/zemod_riguk_punel_liremutujunu.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/49391d279978.pdfIn PDF document text
    • https://volenasidopawo.weebly.com/uploads/1/3/4/2/134265528/f059b3.pdfIn PDF document text
    • https://bokojisegozesu.weebly.com/uploads/1/3/4/4/134479890/zopude.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/6e455914-a9d0-442b-aade-4b4c34891710/howard_miller_clocks_price_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ac88b7-7935-4280-bce4-4a5180a75b42/99099564111.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/gesodivimutoresesitixuf.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144947139/introduction_to_chemical_engineering_thermodynamics_smith_van_ness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa3c45a-d5c3-436c-99f9-cd083ef6d77e/posojedugogukulepagub.pdfIn PDF document text
    • http://favakiwosut.pbworks.com/w/file/fetch/145215528/27505830157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb43f004-6cec-41a5-b149-5c36f1c330ba/ikea_songesand_bed_frame_with_4_storage_boxes.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_off0001524a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524A 5408 bytes
SHA-256: 2775e1adbb3f778b9d700870ced3c360c66c418e53e3b011edd8f860da1e3eaf
font_01_sfnt_off000164ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AD 10908 bytes
SHA-256: 3c2efaa860ad4ba95cac88c55408271fea9c90b367db0eed509c10252ee3e261