Malicious PDF — malware analysis report

Static analysis result for SHA-256 d895acfbddd2f7b8…

MALICIOUS

PDF

84.6 KB Created: 2021-06-06 01:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b00c833bdda3e6638b27de4c24649377 SHA-1: e2469e828212d002bd592174da5974282fd0aca3 SHA-256: d895acfbddd2f7b89d6c3bcff82d2af7e939acb5ea85ff16892310e9ed3bd44c
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 0.9998

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://golowaki.ru/123?utm_term=arnett+new+song++struggle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493266/normal_6000a1905691b.pdfIn PDF document text
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/parutoxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5ff5514991d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_6064d8ecd2f5c.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/xukog-fojalifuwivox-gejogutofav-forogaparimo.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/63618ab2.pdfIn PDF document text
    • https://garixapevawena.weebly.com/uploads/1/3/4/4/134495328/poximodazimat-derejebepetar-xezojan-wabojazoxuxulaw.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/9281440.pdfIn PDF document text
    • https://xizafezepogoja.weebly.com/uploads/1/3/4/4/134446531/2163628.pdfIn PDF document text
    • https://dilopimejaz.weebly.com/uploads/1/3/4/4/134487403/dupikovetosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_606e739b768ea.pdfIn PDF document text
    • https://juvuxoxeziw.weebly.com/uploads/1/3/4/3/134313380/748395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buluwogot.pbworks.com/w/file/fetch/144599046/1162445270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c814e41-ed27-414c-b123-99667c19733b/16651126063.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144498609/not_that_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebe0068-7316-47a8-8d9d-db68df377a45/wowal.pdfIn PDF document text
    • http://jufugoxula.pbworks.com/f/quantos_nveis_tem_o_jogo_homescapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea4e930-2fd0-409e-99e0-def837b787c9/musazavuxutuputezu.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_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 4724 bytes
SHA-256: 73a1450689b5970538324b633d65befb00ac4596aaeb0be849b759aa4f5facdf
font_01_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 11088 bytes
SHA-256: 7568369cacff59819c70c93f56269896b12cc00d6e0e92f4a9567ecdaa2eccce

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