Malicious PDF — malware analysis report

Static analysis result for SHA-256 373fbdb0ac598408…

MALICIOUS

PDF

80.9 KB Created: 2020-11-17 18:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 399fbe5f8e15d1bfb50130820a4a705a SHA-1: 1a6f1f7e1411b9cda9c7a6b4aca2abaaa916ec41 SHA-256: 373fbdb0ac598408bd03aaacfdd231f4776726c65f77784931f4bacb12e7bdc3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafffi.ru/123?utm_term=at-205+re-seal+vs+blue+devil PDF link annotation
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/bazarerin-surilugajexu-jusibut-jopaxig.pdfIn PDF document text
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/nozav-damelopit.pdfIn PDF document text
    • https://biwiporiv.weebly.com/uploads/1/3/4/6/134620494/1203637.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/ruvoz.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/kemizomiteg.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/kulezewutabutitew.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/f7caf57d-2a55-4d67-89ad-6502fb2f9777/47554243383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f8810b-594b-426b-97e5-0e7805e99b9f/zinepejumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdf534a-8b6a-4f2e-a8dc-8b24f868c397/24656822606.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/nejibebazonowekajegul.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/federal_reserve_note_seal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8736ed7-f291-4cec-9c78-5825ac534def/texto_argumentativo_sobre_el_consumo_del_tabaco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b569682-b26e-4cf6-82ac-344026615dea/ghs_bell_schedule.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 5436 bytes
SHA-256: d54cc204ca2272bd0b1ba6b638009393e16591304edeed041f9bd2dc88b5cc48
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10332 bytes
SHA-256: cc60426d9794494b108fd8b83873e6aaf79654821be8d98f2200bd7c3eaceddb
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 18108 bytes
SHA-256: 92a61472dd001b40d06bd4dc0819c99b014bb06a8d875d04c6b92b3f188349cd

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