Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17f46d3f4692c8a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 09:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5cd8100e1a6a8a9349c276e4caab3bfd SHA-1: 872d193956824d436321278ed33c71685569a707 SHA-256: d17f46d3f4692c8ad8c35602c5d944f021c0757d7306b827160dd9f6a576f0d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or distributing malicious content through these links. The ML classifier and ClamAV detection strongly indicate malicious intent, with the links pointing to various domains, some of which are disposable hosting services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wb?keyword=what%20is%20the%20best%20topic%20for%20conversation PDF link annotation
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/jilusebekate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468554/normal_5fe4f5a548dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_5fe70c3c598be.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/jamapuzaxaza.pdfIn PDF document text
    • http://f1l3download.site/what_age_is_the_bfg_book_suitable_for05ikr.pdfIn PDF document text
    • http://whitecheat.xyz/how_to_pray_for_a_good_spouse_in_islamdf24s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390385/normal_5fcbbcba2500a.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/xuzojatukubawixaje.pdfIn PDF document text
    • https://vepufekuso.weebly.com/uploads/1/3/0/7/130775624/5271020.pdfIn PDF document text
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/jepak_fafabukejagure.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/279752.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/78258083248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_60196a143129c.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/7fdb3.pdfIn PDF document text
    • http://instup.xyz/41004282033ggu0p.pdfIn PDF document text
    • http://mestorating.ru/how_old_is_tessa_in_after_we_collided6m9sq.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/rudoxefaja-gejof-lunogolirisowu-gukipexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/mafaxediwasijilo.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/hvac_air_balance_report_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/15288211613.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/lililofixiwelanab.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5284 bytes
SHA-256: 904169b6185a0dd8ecf0f50480b74109ddba73c613995d3b40c386181c0844db
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10152 bytes
SHA-256: 31bee6df6fc9a4be27e6569b304940833d559b6debe08730ef5c206c6692fc03

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