Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd400ee61416092…

MALICIOUS

PDF

95.0 KB Created: 2021-05-28 13:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdfb424700495770fda9aaac9d260b07 SHA-1: 98fc5b452ec8aca68676fa682832b2ec7c580755 SHA-256: 3cd400ee61416092715c0554027ae3a7e017bf61cf7c5318da44cc76419b4949
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://bologen.ru/strik?utm_term=how+do+you+document+normal+lung+sounds PDF link annotation
    • https://vakajufatig.weebly.com/uploads/1/3/5/3/135332685/pipupelifabamovefop.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/mesuvakopidabikaniro.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/jusogeru.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/sotopana.pdfIn PDF document text
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/8538192.pdfIn PDF document text
    • https://rarasuxa.weebly.com/uploads/1/3/1/3/131398432/vidawufow.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/4716911.pdfIn PDF document text
    • https://fejomuzuzozasas.weebly.com/uploads/1/3/4/7/134748710/1133661.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/bugumekage-gajujudusewepop.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/boxeb-wixejesok-wekin-fesef.pdfIn PDF document text
    • https://vupikesuxal.weebly.com/uploads/1/3/4/3/134397623/3d44a6efab13d80.pdfIn PDF document text
    • https://rezedutusijilik.weebly.com/uploads/1/3/2/7/132710703/d5bbd5ea4a.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/731465.pdfIn PDF document text
    • https://puxekubokoru.weebly.com/uploads/1/3/4/6/134683715/691467.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/pejenulu.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/2dd37d44-a7ef-436d-a763-60d494df5d86/is_what_if_its_us_becoming_a_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c23eadf-719d-4ace-b0c2-708eecfaf7c4/jokatesedipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9a38dd-c5a1-4f06-be52-50082a5e519a/91531804744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adfe000-bf8b-433f-918e-9e14423f4263/cuanto_es_200_ml_de_crema_de_leche_en_gramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25813a52-03f3-4842-ab79-b51e69671ea0/taponofuvusagubadanebirep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027fe315-3cef-43e4-8ad4-33955c284f78/volewobewulekukosojiferu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a277f06-1d49-493d-8a90-1009e75358d5/durawerodekuligod.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_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 5416 bytes
SHA-256: 2376a23098bab701c9a4b8b9b29add20ed62578fdab8180b5bc4ed8d8eecb7ef
font_01_sfnt_off00014845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14845 11260 bytes
SHA-256: 56de2a67c20e6846c783ea788efc6e34fc377e91e98e9b0574b4077a4e1417b4