Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fe476651bef9d6…

MALICIOUS

PDF

38.4 KB Created: 2020-03-18 14:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 9cf5dfae254f49aa16b5de9703bfede0 SHA-1: 0671ea836f106aa4545b79429fda9b3e864c00dd SHA-256: 38fe476651bef9d6a731b5e363ce7ce7ef370ea28e351ec9294a4e2525559c4c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

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://succeed2serve.org/uploads/1/3/0/5/130590564/130590564.html#concepto+de+factorizacion+por+agrupacion PDF link annotation
    • http://msjacksonsclass.com/uploads/1/3/0/4/130436180/vevolefegugu-vukumizunuj.pdfIn PDF document text
    • http://newnextsf.com/uploads/1/3/0/5/130588596/pafalosukepopolobima.pdfIn PDF document text
    • http://canarsieeventspace.com/uploads/1/3/0/7/130776687/4376829.pdfIn PDF document text
    • http://ecoaquaconference.org/uploads/1/3/0/7/130740033/nubed.pdfIn PDF document text
    • http://insitesafety.com/uploads/1/3/0/4/130483118/julomivakonagepijaw.pdfIn PDF document text
    • http://hostmaster.camberwellwalkies.com/uploads/1/3/0/5/130588395/1b266d.pdfIn PDF document text
    • http://everydaycamo.us/uploads/1/3/0/6/130621390/2638875.pdfIn PDF document text
    • http://kblawncaresolutions.com/uploads/1/3/0/2/130288458/fca19d7815d.pdfIn PDF document text
    • http://readymum.com/uploads/1/3/0/4/130483983/nenagofonumes.pdfIn PDF document text
    • http://cookstown.ca/uploads/1/3/0/3/130313075/tanamumilelebi.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

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_off00006ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE8 8880 bytes
SHA-256: 2f0d26c2e7cab8770699429250f8eed11e46ad38367718832fe5456b26d3cf3b

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