Malicious PDF — malware analysis report

Static analysis result for SHA-256 611e7a6e07cbc091…

MALICIOUS

PDF

69.1 KB Created: 2020-04-08 20:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab2accd667fbe06c673efcb2c289ae47 SHA-1: d4ec25a2a25ec22c4dba52f3719dcd0754534de8 SHA-256: 611e7a6e07cbc0913586e688a3a51025f95cc6c77184d5b63ea0c28af9c51ff2
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL http://wealtharkcreation.com/uploads/1/3/1/4/131453544/131453544.html#virgin+killing+sweater and numerous others point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wealtharkcreation.com/uploads/1/3/1/4/131453544/131453544.html#virgin+killing+sweater
    • http://crecareerfit.com/uploads/1/3/0/6/130639373/76500a601470534.pdf
    • http://findingproof.org/uploads/1/3/0/7/130776866/9610195.pdf
    • http://bookingbeauty.net/uploads/1/3/0/8/130874305/wegadog.pdf
    • http://boaz-photography.com/uploads/1/3/1/0/131070754/7934370.pdf
    • http://caberlight.com/uploads/1/3/0/6/130605504/2513052.pdf
    • http://neworleansultimateguide.com/uploads/1/3/0/3/130379610/fcc1e6eae.pdf
    • http://webmgv.com/uploads/1/3/0/6/130640125/fogarejimusorajaveg.pdf
    • http://syriimire.com/uploads/1/3/0/6/130640227/5653828.pdf
    • http://nursepreneurmillionaireclub.com/uploads/1/3/0/4/130436162/5688456.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000773d.bin
a1ac0beeb9c76d1b6f34a400f49027572fdd2e70bf2638c64c57403aab5db3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 9384 bytes
font_01_sfnt_off000099ee.bin
5fb1219f8d2b9b5de76bf25f7d7378fa04567d8b2de8a1a794fcdf2b8e3b9b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EE 17860 bytes
font_02_sfnt_off0000d2f4.bin
fc7978a404dc8ba47a383ba85a5350b545db0e39ae2706769479b2da42f1592e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 2700 bytes
font_03_sfnt_off0000dc8f.bin
987e2061325868a3bfa6f6080ead43fcf7d124da683d3ec32d23ca3900b4df6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 3956 bytes
font_04_sfnt_off0000eb45.bin
fb4b619c1d55e9c382756549257a0eeaeffc596c4fd61db9a7d2b639cfb25d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 18568 bytes

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