Malicious PDF — malware analysis report

Static analysis result for SHA-256 09114a20628bdff8…

MALICIOUS

PDF

44.0 KB Created: 2020-06-08 18:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7342a2c5b7727b5722407bc18f43e141 SHA-1: 992c262ff98800ab843bae316271ee73eb506a21 SHA-256: 09114a20628bdff8053028e99f42d555b8056b6165dc7765b78d6eb1b53ac085
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, many of which point to suspicious domains and appear to be part of a link farm. These links are likely intended to lead users to phishing sites or download further malicious content. No scripts were extracted, but the structure suggests a spearphishing attachment.

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://newbostonfamilyclinic.com/uploads/1/3/0/8/130874674/130874674.html#%25D8%25A7%25D8%25B3%25D8%25AA%25D9%2585%25D8%25A7%25D8%25B1%25D8%25A7%25D8%25AA+%25D8%25AD%25D8%25B6%25D8%25A7%25D9%2586%25D8%25A9+mn
    • http://expert24.pl/uploads/1/3/0/2/130270783/pobimitu.pdf
    • http://andyryalsglass.com/uploads/1/3/0/9/130969754/7545285.pdf
    • http://mail.youfish.tv/uploads/1/3/1/3/131398336/lotekibivobeme-mogadisagaj.pdf
    • http://lucusled.com/uploads/1/3/1/4/131452893/dovurodugizijewelofi.pdf
    • http://lawofcyberwarfare.com/uploads/1/3/0/5/130588803/xaxebawogomijapob.pdf
    • http://mail.bay-net.org/uploads/1/3/0/6/130639781/2b45c5c05.pdf
    • http://taiyangchengxianjinyule.br3h.com/uploads/1/3/1/4/131409210/wasoviruku-lixixovojeva-xapejuk-zuwejusovapusod.pdf
    • http://edengabay.com/uploads/1/3/0/6/130604126/fewedez_remugudabe_kalenij.pdf
    • http://shethinksthrifty.com/uploads/1/3/1/3/131380993/xolifufegalemamivari.pdf
    • http://latshawtraining.com/uploads/1/3/0/6/130640155/b01c5b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://penigan.files.wordpress.com/2020/06/86354580694.pdf
    • https://moposabesux.files.wordpress.com/2020/06/56882318110.pdf
    • https://xewajamum.files.wordpress.com/2020/06/34280968850.pdf
    • https://zawamibidixa.files.wordpress.com/2020/06/jojojow.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a9.bin
2c7b39b85f0e731868bfa0cc31c93ec659d1bd58a18ba67243388273b081f964
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A9 17252 bytes
font_01_sfnt_off00007f20.bin
ceff9edaeb08ed54ebf3c57e65f8554d42a39c20a82e1e2ea0b2403065c2b9fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F20 10392 bytes