Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3a3ab05e9d2534…

MALICIOUS

PDF

39.4 KB Created: 2020-11-06 18:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5c80f58e56ae37356c66f4d055fddcf4 SHA-1: d6cb463956bad28e3f84c97d8180408f53230256 SHA-256: 3a3a3ab05e9d253453f44c8f0571fc0418db1f67c5382c01b663f2e78abda03e
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://trafficel.ru/123?keyword=marine+park+jhs+278 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5fa4c3be48473.pdfIn PDF document text
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/8437928.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/gevelogomupegu_batopitadem_ruwelepu_fikilumuzu.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/8288419.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/d92136f.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/viwibutesu.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/3534008.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/e65d3e9ce1ea2cf.pdfIn PDF document text
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/9fd4f27f.pdfIn PDF document text
    • https://ronisimene.weebly.com/uploads/1/3/4/6/134610282/wilakejow-budulujij-bibumawu.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/2919ed.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/6082434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://konomalipu.files.wordpress.com/2020/11/xevasupafes.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/15134477711.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_off00005acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACD 5428 bytes
SHA-256: 1589813bbdd45c112c2283ca7d0b00aec2beb8c04822817242c7e6cdf683f94f
font_01_sfnt_off00006d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D50 10596 bytes
SHA-256: 0e8d00e734bb1b0123f4c1f11c6e44465d86ecfe9b2507fd025ec617637b3c9a

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