Malicious PDF — malware analysis report

Static analysis result for SHA-256 1477e1e77fc4455e…

MALICIOUS

PDF

34.5 KB Created: 2020-05-30 17:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eab4c1541401930d2d6e9d1c8edcd114 SHA-1: c83924b4a017103dff4d7adad02c4304084c633d SHA-256: 1477e1e77fc4455e777312c36ffa655723257cec91d1f414088332ca4d7c13dc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or a method to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://raphayadh.org/uploads/1/3/0/7/130775219/130775219.html#blood+bank+bon+iver+meaning
    • http://endlesspossibilitiesdlk.com/uploads/1/3/0/2/130289227/7929405.pdf
    • http://justaddpiccolo.org/uploads/1/3/0/2/130288684/bc639c3d.pdf
    • http://churchwomenunitedpeoria.org/uploads/1/3/1/3/131381243/4062641.pdf
    • http://hazelynnboutique.com/uploads/1/3/0/8/130813332/tatejifapuwojuneniwu.pdf
    • http://faithfultogether.org/uploads/1/3/1/3/131398372/1887664.pdf
    • http://createspacehub.com/uploads/1/3/0/5/130539170/343654.pdf
    • http://ns1.thedubaiframe.com/uploads/1/3/1/4/131453821/6193928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bc1.bin
5770bcd4db9105425c201fcd239eb50bc8536f7fbfb99a478601681a93cbd40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC1 10504 bytes

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