Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd67c546560b35c0…

MALICIOUS

PDF

41.4 KB Created: 2020-06-06 01:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: cfdfaaf2223dc0ccd5e8de6a2f2bae47 SHA-1: 8216a19710f4ba596dd652dfe451196a6e0a3521 SHA-256: dd67c546560b35c077efaefa7ee696389479a49e50f1e4184f95f10692e855c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classifier's high confidence indicate a malicious intent, likely to manipulate search engine results or distribute further malware. The document body itself is heavily obfuscated and contains some of the same URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://emintgroup.net/uploads/1/3/0/7/130775220/130775220.html#eve+university+npc+damage+types PDF link annotation
    • http://35dollar-tickets.com/uploads/1/3/1/3/131397987/3fa3ef.pdfIn PDF document text
    • http://bookshrinkediting.com/uploads/1/3/0/6/130620625/terujid-zosasujutataku-girale.pdfIn PDF document text
    • http://thissideoftherainbow-org.txlpcsupervision.com/uploads/1/3/0/7/130775393/bogesut_dotube.pdfIn PDF document text
    • http://mrzelectric.com/uploads/1/3/0/6/130605263/nadadexuv.pdfIn PDF document text
    • http://constructioninsurance.net/uploads/1/3/0/7/130739153/9646245.pdfIn PDF document text
    • http://sftutoring.org/uploads/1/3/1/8/131857071/9188191.pdfIn PDF document text
    • http://thelearningagencylab.com/uploads/1/3/0/2/130291579/bakebinu-juxomamib-lukivedeg-bidizav.pdfIn PDF document text
    • http://lsbarbecue.com/uploads/1/3/0/5/130542935/komivo-gejitedusarisu-sakefanuv.pdfIn PDF document text
    • http://gvrclubs.casapaloma2.org/uploads/1/3/0/9/130969191/7ecd9e82870c.pdfIn PDF document text
    • http://emintgroup.net/uploads/1/3/0/7/130775220/terms.htmlIn PDF document text
    • http://emintgroup.net/uploads/1/3/0/7/130775220/dmca.htmlIn PDF document text
    • http://emintgroup.net/uploads/1/3/0/7/130775220/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vokovibawewu126902322.files.wordpress.com/2020/06/89536832977.pdfIn PDF document text
    • https://tumimusazos.files.wordpress.com/2020/06/16551182883.pdfIn PDF document text
    • https://kisinawaku.files.wordpress.com/2020/06/77012023788.pdfIn PDF document text
    • https://rusevaleno.files.wordpress.com/2020/06/79279169608.pdfIn PDF document text
    • https://wivobajet.files.wordpress.com/2020/06/93039540311.pdfIn PDF document text
    • https://kavafof.files.wordpress.com/2020/06/valajudalajaxiper.pdfIn PDF document text
    • https://merefipo.files.wordpress.com/2020/06/19729311819.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 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 10348 bytes
SHA-256: ce6cc87ff8272843cea4f1424d6115da39ff78fbbf9db05b116f6305aef8cc9d

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