Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcd6385ac4b4c99…

MALICIOUS

PDF

72.4 KB Created: 2021-03-15 23:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 361f815b886e961cf28260063c2339e5 SHA-1: ea37f87d078591d2ccf704c06bf09c269bd65a29 SHA-256: cbcd6385ac4b4c99abee92ee936604e5f2a4fdb26880975f1125b0ffb9572a1f
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 0.9998

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://leonvi.ru/123?utm_term=lingualized+occlusion+case+report PDF link annotation
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/dbf1c296f86.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/8686566.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/gAhjrje/dragon_shooting_survival_games.pdfIn PDF document text
    • http://sis-paypal.com/3604197760e5n7e.pdfIn PDF document text
    • http://cheatyou.site/tuwimigofkonx.pdfIn PDF document text
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/mutejido_zudojasegex.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/5649285.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/nepopire.pdfIn PDF document text
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/8595845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd1b63098937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_6049ec1acbd3f.pdfIn PDF document text
    • https://mokegeninu.weebly.com/uploads/1/3/4/0/134017711/porefimifimejamami.pdfIn PDF document text
    • https://cdn.sqhk.co/fuperule/BBhaphg/nokilelavozepu.pdfIn PDF document text
    • http://creditinquiry.info/4640646596l6qti.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/wimikaputipufuvoboni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_60114bc20efd4.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/1c03e.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/7946c34e-305f-48d8-92b1-2a5037d8ca58/xaxijofavowobuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b69f441-e180-4eaa-b8f4-2e19e93acbb5/pixuzufeg.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 5232 bytes
SHA-256: 52b6838106a8c4ace6d2af3dc1079b31a64e3ba33f3ac38525d4ac1fe139f49a
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10496 bytes
SHA-256: 91223ada45bf908832be99c9204f72d66ee5ab41e92a00a00c9530778f07b3a2

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