Malicious PDF — malware analysis report

Static analysis result for SHA-256 616f40fa0256b053…

MALICIOUS

PDF

47.5 KB Created: 2020-05-23 13:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a44e6b33326b3917606f4a5bb36f9e2f SHA-1: 3cc83a3c139c7e133b2d2cb0eebd98324bccbd01 SHA-256: 616f40fa0256b053e1f4faa46530ddbfcc3d3cfc588434c518584ce0692a1364
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL http://74-123-76-63.mgwnet.com/uploads/1/3/1/4/131453394/131453394.html#aa+living+sober+book+online appears to be a lure, potentially leading to a malicious payload download. The ML classifier strongly supports the malicious nature of this PDF.

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://74-123-76-63.mgwnet.com/uploads/1/3/1/4/131453394/131453394.html#aa+living+sober+book+online
    • http://privatechefdelci.com/uploads/1/3/1/4/131437123/ca2f3a4e754.pdf
    • http://texomaspecialtydistributors.com/uploads/1/3/0/8/130814623/dumegisajobi_livujuvo.pdf
    • http://myerbamate.com/uploads/1/3/1/0/131071114/bf7339a5.pdf
    • http://newyorkgogogo.org/uploads/1/3/1/8/131856584/nikamufenu_midurikoxikatis_setepibip.pdf
    • http://davideducatorkent.com/uploads/1/3/0/2/130272557/jewefijiwajap-jikekazawebelug-kizelixuke.pdf
    • http://greenwaybookkeeping.com/uploads/1/3/0/7/130775543/7363738.pdf
    • http://batonlion.com/uploads/1/3/0/7/130738929/tonad-pifibifu-jevaxukoja.pdf
    • http://sflbroker.com/uploads/1/3/1/8/131871556/2bab4c6029b1.pdf
    • http://stuf.ink/uploads/1/3/1/3/131383839/zejafaletajixi-xasuwexipojo-wimelodukokogog.pdf
    • http://bzsmoke.com/uploads/1/3/0/6/130639266/timuvok_rodevinisukana_jejawapukumi_tabinasasez.pdf
    • http://thelakesatsugarcamp.com/uploads/1/3/1/3/131380347/nalodolis-ripelirapodulex-terebafu.pdf
    • http://magneticmindz.com/uploads/1/3/1/6/131606257/0dcfad.pdf
    • http://aaffordableservices.net/uploads/1/3/0/7/130740401/revidulonibori_zakeme.pdf
    • http://championlearnershub.com/uploads/1/3/0/8/130813427/f1034cb12a.pdf
    • http://balancewithkaty.com/uploads/1/3/0/2/130289723/marexowitamaxuz.pdf
    • http://cbportfolioonline.com/uploads/1/3/0/4/130436136/1372264.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca6.bin
2d1419103f7baca24c443a0fa032df32a06c37f6d2dc492a48115ae64bf378fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA6 2576 bytes
font_01_sfnt_off00007661.bin
f9be13398677f42264856f37f1951fc396cf6896508ae12c522205cfd82fc7e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7661 9924 bytes
font_02_sfnt_off0000988d.bin
e3d52de4c3d7bbdcca9676116c921a6efc03031f0088f21596810ec37b4093ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x988D 16780 bytes

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