Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e88458806be4be…

MALICIOUS

PDF

36.0 KB Created: 2020-05-19 14:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a9591876e71dbaed1206e9fd1c09874d SHA-1: e88f3c2293bf29cad51dd3fa4d28f89408175308 SHA-256: 98e88458806be4bef43957af3fb722f75e712af8e481e11b6a540c7afdb542e9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to downloading engineering books. The ML classifier strongly indicates maliciousness, and the presence of numerous PDF_SEO_LINK_FARM heuristics confirms the suspicious linking behavior. The primary IOCs are the numerous external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://medicinaintegrativavalladolid.com/uploads/1/3/0/7/130739549/130739549.html#descargar+libros+para+ingenieria.blo PDF link annotation
    • http://humeshelp.com/uploads/1/3/1/3/131380345/956eb8bdd78c45.pdfIn PDF document text
    • http://ordinarymarvels.net/uploads/1/3/0/3/130379458/kotubokezese-fiwowis-xaduvexevo-sajanaw.pdfIn PDF document text
    • http://elsamae.com/uploads/1/3/1/8/131856333/128298.pdfIn PDF document text
    • http://thompsonzing.com/uploads/1/3/1/3/131398104/1581abce273c93.pdfIn PDF document text
    • http://muraclemaidsllc.com/uploads/1/3/1/8/131856068/99328da4.pdfIn PDF document text
    • http://mantissecurity.us/uploads/1/3/1/6/131636602/japanogit-dusoze.pdfIn PDF document text
    • http://powerfulthinking.org/uploads/1/3/1/3/131378993/65f9b30a167cace.pdfIn PDF document text
    • http://blacksprat.com/uploads/1/3/0/5/130551675/kazebojuzinol.pdfIn PDF document text
    • http://bossinvogue.com/uploads/1/3/1/4/131453630/xopigege-wudexisume.pdfIn PDF document text
    • http://jmtsalesfleetservicesprosltd.com/uploads/1/3/0/4/130488934/7687690.pdfIn PDF document text
    • http://stefaniefusi.com/uploads/1/3/1/4/131436978/1e27acf82b17.pdfIn PDF document text
    • http://babysfirststories.com/uploads/1/3/1/6/131607054/c8378b16.pdfIn PDF document text
    • http://fromblocktorock.com/uploads/1/3/1/4/131437969/4676832.pdfIn PDF document text
    • http://jscords.com/uploads/1/3/0/6/130604056/rowirozewuvovigato.pdfIn PDF document text
    • http://msoenterprises.net/uploads/1/3/1/4/131483400/4b8e67144.pdfIn PDF document text
    • http://mariandclairegetmarried.com/uploads/1/3/0/6/130605475/newofirito.pdfIn PDF document text
    • http://lminternationalinc.com/uploads/1/3/0/6/130604417/9422903.pdfIn PDF document text
    • http://bndrzen.com/uploads/1/3/1/3/131398246/a8f0aa.pdfIn PDF document text
    • http://smallbeginningsfamilyfarm.com/uploads/1/3/0/4/130483331/nopokomapaxir_jigebozojusiso.pdfIn PDF document text
    • http://madisongahaferart.org/uploads/1/3/0/3/130379435/3359678.pdfIn PDF document text
    • http://bartpatrzalek.com/uploads/1/3/0/3/130313289/dexugilifek-xuxaga-wizanonigaw-mazaxadiram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

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_off00005f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 10772 bytes
SHA-256: ab9311c7ce722571f6d6736b6410cb9026b56cf6c4e0f8d2a6da0480828c1e47

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