Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee65a1d057af713…

MALICIOUS

PDF

38.9 KB Created: 2020-06-07 14:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1820048f6f3cf6ac51ed1fcfb9296ee SHA-1: 9381278999fc942ef7e390a62b6ad5fd5dd74608 SHA-256: 6ee65a1d057af71301f0449b267a14d065e56a6c6783e8cafde7b1f0ee7fe64e
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to PDF files hosted on suspicious domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a link farm intended to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to external sites.

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://lonewolfski.com/uploads/1/3/0/6/130639397/130639397.html#k%25C4%25B1rk+ya%25C5%259F%25C4%25B1ndas%25C4%25B1n+s%25C3%25B6zleri
    • http://ak-47girl.com/uploads/1/3/0/6/130621698/679d69.pdf
    • http://pngdata4development.org.pg/uploads/1/3/0/7/130776058/0c507b96.pdf
    • http://agacello.com/uploads/1/3/0/4/130476557/fec0048871a15.pdf
    • http://davidjosephryan.com/uploads/1/3/0/4/130435659/a2dc355bb46.pdf
    • http://rhgcexsrv1.raffertyholdings.com/uploads/1/3/0/6/130640102/058566d7c58aa.pdf
    • http://rattingonrodents.com/uploads/1/3/0/5/130546434/deguvofe.pdf
    • http://autodiscover.beautiquestyles.com/uploads/1/3/1/3/131383204/4588268.pdf
    • http://tuscvalleydressageasso.org/uploads/1/3/1/4/131437813/bonew_kisok_jirasupigufike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wovigesop.files.wordpress.com/2020/06/87965086652.pdf
    • https://lixotudus.files.wordpress.com/2020/06/93376804733.pdf
    • https://tujakaf.files.wordpress.com/2020/06/rilebaxubuwafejigawedi.pdf
    • https://babesakaj.files.wordpress.com/2020/06/porotukosifudad.pdf
    • 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_off000068fd.bin
2c90222a34f7c05d64836a804103e3fff9592ab0e679554631fe08b1987ebf61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 11716 bytes

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