Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e660dc42dba7889…

MALICIOUS

PDF

81.0 KB Created: 2020-11-09 10:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 53cd417c76d0eb5c34081e1d5ef6695f SHA-1: dc927c9861db78e2009d5b3a7f7c120d775777b6 SHA-256: 9e660dc42dba788931b55dd7aa9af81936b331831fe9f0afea82957a84c89886
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://traffine.ru/aws?keyword=pokemon+gen+4+starters PDF link annotation
    • https://rekubiregidejel.weebly.com/uploads/1/3/4/4/134464182/4970844.pdfIn PDF document text
    • https://rawofaweka.weebly.com/uploads/1/3/0/7/130775842/gimivedemobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zosejejitem.files.wordpress.com/2020/11/99243458657.pdfIn PDF document text
    • https://punumovuzup.files.wordpress.com/2020/11/6469249680.pdfIn PDF document text
    • https://xigikomi.files.wordpress.com/2020/11/20503209757.pdfIn PDF document text
    • https://webulor.files.wordpress.com/2020/11/dbms_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61a4ded-bda2-4cc9-affc-72beceaaae7f/jujitosilodano.pdfIn PDF document text
    • https://tuwomufewib.files.wordpress.com/2020/11/95720719159.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://kugudad.files.wordpress.com/2020/11/public_company_advantages_and_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/sociological_imagination_summary.pdfIn PDF document text
    • https://pizaxajejodu.files.wordpress.com/2020/11/16121707018.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 10280 bytes
SHA-256: 8977aea4c945bd6198e466471b48fad939bc05ea77f60e94d7c8260c526c94ae
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 5124 bytes
SHA-256: ba83c7d281db237c9ffdb55d61b638fd820d76f599519f86ffbcd50b79262718
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 11748 bytes
SHA-256: ff62ddc6212f5a5095a800793281e9ccb75d22b023255d41f3fe3971cdf5a0bb

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