Malicious PDF — malware analysis report

Static analysis result for SHA-256 025f4da43d57d5de…

MALICIOUS

PDF

47.5 KB Created: 2020-11-07 04:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c834b4e76e90d7fdb7fa2a4d0cc885f1 SHA-1: 98f733dc5950a9bffdf71bdca78d2ea222516330 SHA-256: 025f4da43d57d5de3568fec3458807d0482110fb80c58c2e838dbd7d77c69b0f
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://trafftec.ru/123?keyword=jetta+service+manual PDF link annotation
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/fed77d9b9a.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/rudixeja.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/guriwig.pdfIn PDF document text
    • https://zutovabofilosu.weebly.com/uploads/1/3/4/3/134333865/pigaxojeb.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/dixusud-gupew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fewimeni.files.wordpress.com/2020/11/nugam.pdfIn PDF document text
    • https://bidarewabune.files.wordpress.com/2020/11/scratchjr_for_windows_7.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784e8b71-c523-471e-9544-6d944d7a19c8/39726973299.pdfIn PDF document text
    • https://toxuzan.files.wordpress.com/2020/11/nuvejofisamuwosifiripula.pdfIn PDF document text
    • https://tevadegodi.files.wordpress.com/2020/11/647921009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09aab066-dadf-46a3-b4cb-4e5aafaeceb1/56989700323.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.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_off00007bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCB 4992 bytes
SHA-256: 3c89c582112c251fd713e781e1ac07cf6db879731b33f1815a4573d7696a3563
font_01_sfnt_off00008cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 10748 bytes
SHA-256: 5512cf42ec020aeb87fc1c830f2055a924b100d4b36b93e9bc78e791bc31d741

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