Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62ac5ad739edc81…

MALICIOUS

PDF

56.0 KB Created: 2020-11-07 05:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 77ebd09ded2bff66d1cc1675c71c16d6 SHA-1: d768bd164ba7a7dfc106bd7d3d727b5253c82e2d SHA-256: d62ac5ad739edc81a8e2e19a1395a71e262ab6e106313e92136e2351bd5c8bf4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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/aws?keyword=teddy+bear+dog PDF link annotation
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/losodogif_dobatewerotulu_juvurasev_vojimib.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/tesokor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f8c8054e8a2e.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/1088852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fa358314f1b4.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/jejesusuxekemox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fdde046e-d34e-4cf9-ab39-78dcbe975164/43077304870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc850ca-6e82-4247-88d0-43f717e3143c/27354164457.pdfIn PDF document text
    • https://zizugojos.files.wordpress.com/2020/11/15502229161.pdfIn PDF document text
    • https://tufebofajo.files.wordpress.com/2020/11/wind_beneath_my_wings_sheet_music.pdfIn PDF document text
    • https://rarokazuj.files.wordpress.com/2020/11/mekifebiramupemadukifebi.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/wixasidivumazenogodoz.pdfIn PDF document text
    • https://natosibitet.files.wordpress.com/2020/11/cheque_em_branco_filme_completo_dublado.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_off00009171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9171 4528 bytes
SHA-256: 1b38e73b3b6ccfb070a2707e2fea06ca797ed05941f87c38ddb6384bc269fd2d
font_01_sfnt_off0000a0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E2 10680 bytes
SHA-256: 5928c52f58418bd9ea437dac7079498755bb3207c786a947d417e4fa8299a5b3
font_02_sfnt_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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