Malicious PDF — malware analysis report

Static analysis result for SHA-256 d618805bfea178a7…

MALICIOUS

PDF

30.3 KB Created: 2020-05-15 06:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd57a36011055dd3fd41fb8bb9e5ca7 SHA-1: e560e62e8d92897e5de9dd6d05a2151fc8618360 SHA-256: d618805bfea178a7a921f2ea47647e8ffe450c5406709445eba1da2eb317b8cb
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to numerous PDF files hosted on various domains, suggesting a link farm or distribution network. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, and the document body is largely unreadable, but the extensive external linking pattern is highly suspicious.

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://iwalkedtojerusalem.com/uploads/1/3/0/5/130551554/130551554.html#rbi+intermediary+guidelines+2009
    • http://kalgarcia.com/uploads/1/3/0/6/130620469/mujofenuridena.pdf
    • http://nataliegmartin.com/uploads/1/3/0/2/130272877/relokevufidamuzibof.pdf
    • http://pugetsoundlawgroup.net/uploads/1/3/0/2/130287502/2889136.pdf
    • http://christianlanierlaw.net/uploads/1/3/0/5/130551186/muluwavemizem-saxatune-tigejogukig.pdf
    • http://goodfoodwelove.com/uploads/1/3/0/5/130588288/8200038.pdf
    • http://mommasjewelrybox.com/uploads/1/3/0/4/130491752/buxonevogelixo.pdf
    • http://gracelegacies.com/uploads/1/3/0/6/130639678/5249243.pdf
    • http://lovealchemywellness.org/uploads/1/3/0/7/130776616/tosezukirabepoja.pdf
    • http://seabreezedevon.shop/uploads/1/3/0/5/130544078/8780015.pdf
    • http://myhopecoach.com/uploads/1/3/0/6/130604731/8529506.pdf
    • http://advantageamerica.info/uploads/1/3/0/4/130489800/b8e9eb5b01d8.pdf
    • http://bridgeadvantagevision.com/uploads/1/3/0/9/130969488/piwul.pdf
    • http://livelegendaryllc.com/uploads/1/3/1/4/131454482/5826281.pdf
    • http://ueeservices.us/uploads/1/3/0/7/130740530/jejimirefokofo_zavakejovupapo_papuvo_xerugokitex.pdf
    • http://newhorizonmallleasing.com/uploads/1/3/0/4/130488091/gisinupufutoseg.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f09.bin
7b8a76523887af11988aa60b5cd2a1102233b02c797eade857a06af4b2504144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F09 9084 bytes

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