Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f86930d8b753b6…

MALICIOUS

PDF

120.9 KB Created: 2021-05-22 10:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d6ec7dee8fe2cd9d24275feb85a5c44 SHA-1: 962949a3f5a8ada0b1fbb0389bbac3ec4a2e4ab4 SHA-256: 99f86930d8b753b69299cb27a6bbf72758dc26a05d616356782f0323d7110646
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 0.9997

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://seumenha.ru/strik?utm_term=data+de+lan%25C3%25A7amento+do+velozes+e+furiosos+9 PDF link annotation
    • https://wegeduvoxu.weebly.com/uploads/1/3/4/6/134634177/furemufepi.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/9850159.pdfIn PDF document text
    • https://tegubefebax.weebly.com/uploads/1/3/4/4/134431627/963418.pdfIn PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/sodemora-volakiwurafow-bokozu.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/5f10d9d7fe42d.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/eeb9ae7.pdfIn PDF document text
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/e0197.pdfIn PDF document text
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/4365878.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/efb0ed5fedc.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/6681226.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/7704197.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/lekobofatud.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/9001920.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/miraz.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/c74fb7ec-9518-4fa4-b0c6-920bf7205c00/sakumigogowabinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18eb334a-e3b4-4690-91e7-bd4b423f16f4/91321993039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe40459b-7aef-4e4a-b645-03e372a94071/kiguxibawudor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269c2167-b078-4191-b5c7-d07db61e5572/how_to_download_facebook_friends_mapper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e17131-7764-4026-8a83-63446acf0bf3/tiwizuvibebikozipewakolog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1dfcde-941d-4210-953f-52374193b115/vilitukapofegev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349b4d3f-3e84-4c5b-b93d-6138e55bca1e/dolerevugep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F64 2208 bytes
SHA-256: a7086f94c7785b84d430800890023e3fd41998bc97d3574bba917ecf693bea59
font_01_sfnt_off0001994b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1994B 5500 bytes
SHA-256: 625f6611b07df50305396694baed0eece5ddac22c9e0cd3c8f9a324c9d28d618
font_02_sfnt_off0001ac02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC02 11560 bytes
SHA-256: 0ee9114ce034f1710448e6f13851a16bad68cf9b2734144ca94fa2a5a57c08db